Ok I've died for the 5th time now due to dehydration. What is the secret to survive?
Wear you camel pack, if you aren't. Prioritize chopping down trees and feed saplings into the transposers for water at first. Basically, keep an eye on your transposer. If there isn't 2 buckets worth of water in there, go crook more leaves. Fill bottles as necessary to refill your camel pack. Make a survival generator as soon as you can to trickle charge the transposers, but the flux capacitors will be enough in the early game.
Later when you have a furnace, turn rotten flesh and saplings into dirt in a crafting grid and keep it to one side. As your camel pack empties, you can turn the dirt into dirty water and smelt that in a furnace to clean it, excess dirt can be used to expand your tree farm and farmland for your crops.
After that, when you have a crucible, make shears and shear leaves. Hopper over a crucible, leaves in hopper, pipe water out of crucible into a portable tank. Right click empty bottles to fill them.
Much later, make stone barrels. Make a harvester. Have it chop down trees. Pipe saplings into stone barrels, pipe dirt from stone barrels into an autocrafting setup of your choice. Pipe dirty water into a furnace of your choosing, pipe clean water bottles into storage for later use.
Edit: Read the quests thoroughly, they will guide you.