WATER WELD by j-b weld.
Drinking water safe
Repair and Seal underwater or in wet conditions
Ace Hardware carries it.
You can actually permanently
patch a hole under water with it! It comes in a tube the size of a jumbo crayon. It's 2 colored putty, mix together and slap it on. Dries as hard as concrete that you can drill it or sand it. I've used it several times and it's a permanent fix that works when it comes to water items.
This stuff is incredible. You most likely will not have to even drop it to have it repaired after you patch it with this stuff.
check the specs out here
http://www.jbweld.com/product/j-b-waterweld/