I believe Shape Water could be used to waterboard someone, yes.

Here is how I see this.

You can move the water up to 5 ft in any direction, but you can't make it fly higher than 5ft, because the water will simply fall between 2 casts of the spell.

You can make 3D shapes from the water as long as they don't leave the 5ft square. You can then move that shape 5 ft in any direction, but again it will fall after the cast if it is in midair. Otherwise you can make a sphere/halfsphere/wall of water and move it around 5ft with each cast to have movable cover.

Tbh I'm obsessed with idea of making an ice sword with his cantrip. Like you put your hand in water, freeze it in a form of a sword, pull out and boom! You have an ice sword. Well it wouldn't be very durable butt if you can move water than you can hold it in one piece. Like imagine carrying a bag of holding filled with water and making different weapons and objects with it! You need a key to room? No problem! Fill lock with water and move it untill the door opens. You lost your hand? No problem! No need to be an artificer to make a prosthesis, just use shape water to mimic your hand and now you not only have a hand but you can for example extended it, or make your "fingers" sharp pieces of ice to hit someone etc.

While you nerds are talking how to drop water on people, i ,am a nerd too, but use more creative!

Also if you were to attempt to freeze the water, if anyone or anything was hiding in it wouldn't freeze.

Cover a hole or a pile of clothes in the corner of the room with water, and then attempt to freeze it.

Why did you guys reply to this like it's homebrew?

one creative use i've thought of for this that i haven't seen mentioned elsewhere is how this reacts to lightning and thunder damage since both would reasonably be better in the right kind of water. everyone knows that electricity and water don't mix. everyone also knows sound travels better in water than air. so if you were to cover a creature's head with shape water, then have an ally use a lightning or thunder based spell on said creature, aimed at the head. you should theoretically be able to deal more damage from the lightning or thunder spell, while also trying to drown the creature

Un cuchillo o algo cortante sería una forma básica?

Ahora que lo pienso... ¿ no se pueden usar 2 efectos al usar metamagia?

Los cubos tienen la misma altura y ancho, así que si su ancho son 5' entonces su altura también, osea que si son cubicos

https://www.reddit.com/r/DnD/comments/jgdyn5/shape_water_can_be_used_on_ice_and_snow_and_steam/

You could do 3 and 6. Just make a wall shape with the water and have it stay for an hour, then freeze it the next turn. And if it is the tiniest stream you have ever seen, you'd be able to make some sort of dam made of water to stop it up.

For new players: both RAW (rules as written) and RAI (rules as intended), you cannot, and I mean cannot use Shape Water to freeze the liquid in a person's lungs or make them drown in it. As the spell states, you can only affect water that is not currently occupied by a living creature. You can still use Prestidigitation to soil a person's undies (DnD is typically set in a medieval world so they honestly might not be wearing any), but you can definitely not use this spell for anything other than party tricks, various schemes, and creating ice walls. Also, don't think of re-shaping the water as just creating a cube, think of it as reshaping the flow of the water Percy Jackson style (but still in a 5ft^3 space). You also can't move and freeze the affected water in the same turn RAW, but it's honestly pretty useless that way, so talk it over with your DM and call them a d*ck if they don't let you move and freeze it to make a barrier in one turn when you're in combat. Oh, and you can't use this spell as an umbrella or create well-defined shapes, but honestly it has literally no effect on the campaign as long as you don't try to create Artisan's Tools or weapons, and even then, the players should be rewarded for their big brains with big payoff, so talk with your DM and promise to be on good behavior as long as you're allowed to use this spell to its full potential. 

Could you use this spell to freeze water into 5' spheres?

I'm thinking of preparing an ambush where I could roll a couple of these down a hill.

Never mind. I just found the answer (it's 'yes' by the way):  https://rpgbot.net/dnd5/characters/spells/shape-water/

Some examples of how you could use this in conjunction with bullet 2:

• Freeze a door, a window, a gear, or another moving part to keep it from moving
• Freeze a water source at a choke point to block its flow
• Free water and give it to someone; unfreeze it to convey a pre-determined message like “we’re in trouble”
• Freeze water in an open body of water to give you something to stand on
• Freeze water in the shape of a flat surface covered in spikes
• Freeze water inside a lock; the expanding water breaks the lock
• Freeze water into a sturdy shape to bridge part of a body of water
• Freeze water into the shape of a sphere then roll it down a hill
• Freeze water into the shape of a wall to give yourself cover
• Freeze water to damage or slow a ship

A cube is 3 dimensional, so 5 x 5 x 5 = 125 cubic feet

Holy water icicles - poke demons and vampires for 2d6 holy damage xD

Freeze a 5-foot cube of water, and have it flow downstream and crash into something. Freeze a 5-foot cube of water at the bottom of a drain and let the water back up

Can I use this to make myself ice claws? I'm planning on using them to climb walls. A pair of clawed gloves and boots to scale stone walls, is that possible?

I'd rule snow is ice which is not water.  I think this spell's animate / move features are for specifically the fluid state of h20 called water.

 can you target the saliva in someones mouth and drown them with it?