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In Tomb of Annihilation you have the mechanic in the game where you have to drink more water than normal. Since you can't really rely on the rain catcher all the time would a good subsitute be the Ranger/Druid spell Goodberry?
With Goodberry, one “berry provides enough nourishment to sustain a creature for one day.” Would this be enough or would player characters still need more since there is a higher need for resources?
Jeremy Crawford tweeted the intent behind the Goodberry spell - the "nourishment" provided by it still doesn't save you from thirst:
The nourishment provided by goodberry is meant to be like food, not water
So even if you eat goodberries, you still need water in Chult.
In the same tweet JC adds, that
a DM can say otherwise
So there are possible situations, where DM should make such a ruling. In Chult PCs need to drink a lot of water to survive, I'd say you shouldn't allow your party to completely neglect this part and just use Goodberry (by using all remaining spell slots before a long rest, for instance). But this depends on the DMing style and is opinion-based.
Goodberry says "... the berry provides enough nourishment to sustain a creature for one day."
Nourishment is not a game term so it takes its normal English meaning. The OED defines nourishment as "The food necessary for growth, health, and good condition" and food as "Any nutritious substance that people or animals eat or drink or that plants absorb in order to maintain life and growth." Water is a "nutritious substance that people or animals eat or drink ... in order to maintain life and growth."
In summary, a Goodbery gives you what you need to stay alive for 1 day. Whatever that is.
As an analogy, in a cold climate you need more kJ per day than in a hot climate to maintain body heat - those kJ are "nutrition" - does this work or is Goodberry only good in temperate climates?
As a game mechanism, Goodberry is serving exactly the same role as the rain catcher - it is draining party resources. For the former that comes in the form of a 1st level spell slot, in the second, in the form of treasure to buy it, time to use it and the risk of exhaustion when it doesn't work. For low level parties the spell is a serious investment and the rain catcher isn't: for high level parties the calculation changes, however, raw survival is rarely a concern (or a fun thing to play) for high level parties anyway.
