» Fri May 27, 2011 1:55 pm
For recharging... Azura's Star. Most likely, since it's easier than carrying tons of soul gems.
As for using Destruction, or any other magic, best to learn spell stacking and spell chaining techniques. You probably won't use the latter, though. However, the former would help you understand how to use magic to soften up your foes so that you can eliminate them much, much easier.
In addition, Touch spells are useful underwater and are often more effective than swinging melee weapons.
And as was stated already, be aware of the penalty due to wearing armor when trying to cast.
Oh... also, you may want to use Disintegrate Armor (possibly make your own that is more efficient) and dissolve armor on every corpse you see/make. As you dissolve the armor piece by piece, take it and repair it. This trains Destruction + Armorer, and I'm sure you want the latter to be high.