Answer:
Where humans breathe liquid.
What get's more wet while it dries?
This is the drinkable phase of matter
I call the trees my home, yet I never go inside, and if I ever fall off the tree I will be surely be dead.
What is all over a house?
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.