So the other day my older brother found a verizon htc droid Eris (in the snow) and I really have no hope for it because he said there was water behind the screen (as you could see it sloshing around) could it be repaired
No hope whatsoever, no. If you were serious about trying to dry it out and use it as a tiny internet-only tablet, well, you'd need some MAJOR luck and something a BIT more, shall we say, effective than dusty, scratchy rice.
You'll want some desiccant, like you can buy at Harbor Freight or any other major hardware store -- they sell it to dry out the air going into the lines for shops that use pneumatic tools. Pull the battery, leave it open, and put it in a sealed plastic bag. Leave it alone for a week. Then you can check to see if the water's all gone.