There was once a mod, by Shalinor, which added a spell called "Fool's Recharge" to restore player's Magicka via enchanted items. Unfortunately, as far as I know, that mod is now gone, mostly because of gamespy.com not being a thing anymore. So, not being able to find a replacement for that, I constructed my own mod, which does pretty much the same thing.

This mod is very simple. It makes exactly 3 changes:

1. It edits the base cost of the "Restore Magicka" effect, so that it isn't so overpowered. That is a global change (i.e. a change to magic itself, not to particular spells), so it may break some things making use of that effect. It also makes that effect usable in spellmaking and enchanting.

2. It adds a spell called "Give Magicka". This is a little spell that one of the Apprentices of the Mages Guild came up with, which allowes to transfer some of your Magicka to someone else.

3. It adds that spell to the spell list of Estirdalin (the above-mentioned Apprentice) at Balmora Mages Guild.

Once you buy the spell, you can use the effect however you want. Casting it on yourself is not useful though, as it was with "Fool's Recharge". A better way is to enchant an item with it, basically creating a Magicka accumulator that you can drain on demand.