Quote from cericksen >>

You can get this with Life Domain Cleric so why isn't that listed?

 I don't see that Life Domain clerics get goodberry?

Goodberry "Modified":
Lvl.1st
Casting Time:1 Action
Range/Area: Self, Touch
Components: V, S, M*
Duration: Instantaneous
School: Transmutation
Attack/Save: None
Dmg./Effect: Healing
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Up to ten berries appear in your hand and are infused with magic for the duration.
-A creature can use its action to eat the berry(ies).
Eating berry(ies) restores 1-10 hp, and the berry provides enough nourishment to sustain a creature for one day.

The berries lose their potency if they have not been consumed within 24 hrs. of the casting of this spell.

* - (A sprig of Goodberry bush.)

Quote from BurningFalcon >>

Ok people, let's break this spell down and "destroy" some ideas written in the comments.

1. Up to ten berries appear in your hand and are infused with magic for the duration. + The berries lose their potency if they have not been consumed within 24 hours of the casting of this spell. + Duration: Instantaneous

You can cast this spell, and summon 1-10 berries (amount of your choosing), in your hand. Within the next 24 hours, the give you written effect. After 24 hours, become regular berries.

2. Disciple of Life + Goodberry

"starting at 1st level, your healing spells are more effective. Whenever you use a spell of 1st level or higher to restore hit points to a creature, the creature regains additional hit points equal to 2 + the spell's level."

While you can restore 1 hitpoint by eating a goodberry, it is not a spell that is healing the creature eating it. The spell is to summon berries, that have a magical effect.
You won't get additional healing through Disciple of Life.

3. Baking Berries or making drinks/potions out of them.

Alright, you made a potion or baked something with multiple Goodberries, and you're eating/drinking it to restore multiple hitpoints.
Congratulations! Make a Constitution Saving through with a DC of 30, because you just now consumed multiple Berries, of which A SINGLE Berry nourishes you for a whole day, AT ONCE.
Imagine eating meals for 3-10 days within a single hour. Yep, that's probably how you're going to feel now.

So, if you pass the DC of 30, you'll just puke, get the ***** and sweat a bit. If you don't pass the DC, you also fall sick for 1d6 days. - That's how I would rule this nonsense.

4. Force feeding a unconscious or enemy creature.
I would asume, that you could do that, but it depends on the circumstances. For an unconscious creature, you would have to help them to swollow them, which would probably take longer than a single action.
You could force an enemy creature by (for example) shooting it with a slingshot (DC depending by the size of the creatures mouth) in it's mouth. BUT the creature won't take the action to "eat" it. They would do a constitution saving through to spit it out, swallow it, or choke on it. Depending on the DM and the creature's throat size, I would say.
Now, why would the creature not take an action to eat it? Simple because the action is meant for taking the berry, putting it in the mouth and then chewing&swalling it.
Just compare the time needed by eating 1 berry and by throwing a berry in someone's mouth who isn't expecting it. You'll realize, that the first action would take more time for you, then the second action would take time for the other person.

 for your 3rd ruling on this, I think that it would just apply the all the berry nourishment effects and apply all hitpoints from the other berries, because it says that it feeds enough to nourish you, so it would apply the first berry then feed you the next berry giving you little to no nourishment.

cool

the duration being the time after casting is 24 hours then the berries rot is how we play this

Player.   *finds a ton of mistletoe*    Can cast this.            Player * “useless”*

 I don't believe goodberry has a creature size limitation, meaning this can feed an elephant. Feed isn't expensive, but an elephant eats about 330-375 lbs. of vegetation per day, and they spent 16 to 18 hours a day feeding. A huge herbivore isn't a very practical animal to bring along.

Mistletoe berries sound like they would be bitter. Any tips for making it more palatable? Mix with sugar for goodberry jam?

Maybe it's empty calories. Sort of like how feeding Corn to our cows is causing long term health problems, feeding mana infused berries to our live stock as a primary food source probably wouldn't be sustainable.

For a week long journey using an elephant or dinosaur mount, this is a great idea 💡 

No it takes an action to eat, if you are uncnious you do not get an action

healing word works just as well as goodberry.

i hope