Bam!

http://www.uesp.net/wiki/Skyrim:Enchanting_Effects

If you're looking for guidance, Fortify Destruction will increase the efficiency of fire/frost/shock enchants on your weapons, causing them to consume fewer charges per hit. Water breathing is a crummy pick, imo, since you can just throw it on a 0.3 lb. ring and explore to your heart's content.