Fruit trees and necessity

[Ignorant]

Will fruit trees make fruit without water?

If there is no water, there are no trees in the first place.

Does the presence of water determine whether or not a fruit tree will make fruit?

No.  It's availability and amount, not it's presence, correspond to increases and decreases in average yield...both in the upper and lower ends.  Too much - lower yields.  Too little, lower yields.  Plenty but none of it the suitable ph or salinity, lower yields.  

Floods and droughts and poisoned tables are all expected to effect yields negatively, because all correspond with crop failures in our model.

Great! It is nice to know that you are so knowledgeable of fruit trees. I'll remember that for future reference. So you're a qualified "yes". Thanks!