Purify Food and Drink

i used this to become a king of a city that food was rotten

Enjoy non-alcoholic booze for the rest of your days, tavern dwarfs!~

Is this spell reversible?

Quote from Grandpa_Tuck >>

Is this spell reversible?

Do you mean: can it be used to poison food and drink that's clean?

If so, the answer is no. In D&D, a spell only does what the spell description says it does. This one doesn't say anything about poisoning food, so you can't use it for that.

they removed the disease removal from the food and drink spell.
rot and disease in this context CAN be synonymous.
but most of the time, they are not.
you have a steak, the steak was left out too long, meaning it is rotten.
an assassin poisoned the steak.
the steak due to being left out too long, also has botulinum bacteria, a disease.
you cast purify food and drink on the steak, it still has botulism.
this spell is not good if you are dealing with food or drink that actually risk disease, such as historically speaking, milk, which spoiled fast, and also was unpasturized.

Quote from Grandpa_Tuck >>

Is this spell reversible?

 

 Yeah, you can re-poison the food easily with the right tools

Quote from xXloorpik_slayerXx >>

Quote from Grandpa_Tuck >>

Is this spell reversible?

 Yeah, you can re-poison the food easily with the right tools

I think what they were getting at is that some previous editions of D&D had the concept of "reversible spells", spells that could be used for two opposite effects. For example, the same spell could either cause or remove blindness, or heat or chill metal, or unlock or lock a container.

This is whole concept no longer exists in 5e/5.5e D&D; the last vestige of it is the spell Enlarge/Reduce.

Quote from wagnarokkr >>

Quote from xXloorpik_slayerXx >>

Quote from Grandpa_Tuck >>

Is this spell reversible?

 Yeah, you can re-poison the food easily with the right tools

I think what they were getting at is that some previous editions of D&D had the concept of "reversible spells", spells that could be used for two opposite effects. For example, the same spell could either cause or remove blindness, or heat or chill metal, or unlock or lock a container.

This is whole concept no longer exists in 5e/5.5e D&D; the last vestige of it is the spell Enlarge/Reduce.

 You still see that in cantrips, for example Control Flames lets you brighten or dim fire, and Prestidigitation lets you clean or soil surfaces, and chill or warm food. Though I suppose you’re right that you don’t really see this concept used outside of certain utility cantrips.

Could this spell be used on/in wells? If so, what would the cost of the spell being in the well's structure? I'm unsure if this would still be Transmutation or Abjuration

Quote from KayinKrueger >>

Could this spell be used on/in wells? If so, what would the cost of the spell being in the well's structure? I'm unsure if this would still be Transmutation or Abjuration

You can use it on the water in a well, but as stated in the spell description it only affects the water in a 5-foot-radius Sphere.

I am not sure what you mean by "what would the cost of the spell being in the well's structure". If your goal is to purify the water source leading to a well, this spell is probably not what you're looking for, since its area of effect is relatively small. Its intended purpose is largely to purify a meal being eaten by a party of adventurers. 

Because it's Utility magic, wouldn't an Artificer want to create a device that can be installed to several wells for a town/city or keep to help reduce possible outbreaks? If that's the case, then it would need some sort of magic-tech runes and source like a battery. The best gemstones that are associated with water purification are: Shungite, Aquamarine, and clear Quartz; they would serve as the spell's core or battery that can be recharged or replaced, while a glyph or magic circle would activate the spell.