Maybe you can fix so that the water flasks restore health instead of manna, i think its weird that if you drinking out of a water barrel it restores health but if you drink out of a flask it restores mana...water as water!
i looked into it, i replaced some code from It_Apple.tple into It_Water.tple since that one restores hp, but alas in game it doesnt change, so its done in a differen way then my simple edits i did with weapon and such, or the game doesnt look for a potion in templates folder, but maybe in another named folder