This isn’t much of an idea, putting a side the fact that people have mentioned it before in a previous "magic idea post, this is mostly a example of the default way to get mana back in almost any game with magic in it.
I’m sorry but this post doesn’t really add anything to the basic idea of a mana potion which is the default idea that comes up when someone thinks of “other way to get mana beside regen”
It would be good to explore the interesting ideas you can do with mana (and mana potions) besides
mana potion (that gives you mana) found as loot (in the two normal looting areas), that glows (with magic most likely). Mana would have a bar, and there would also be a skill to have more mana, also visual effect when insufficient mana.
I try not to get annoyed about this stuff, but the devs prefer having one post for an idea and everyone discussing that idea to make it better, but posting the textbook definition of a mana potion doesn’t add much of anything.
A better thing to do is give ideas about how it would work, such as mana fatigue making you unable to spam mana potions, though that isn’t even original in the slightest.
Maybe something more than it being a loot item, why not a way to produce them more reliably, much like the TP potion we have, but have a cost to it, such as the mana spring is in one of the camps, or you can turn unused mana into pure mana to put in a potion?
How about two exclusive mage skills, one that doubles the natural mana regen of the player, but makes mana potions give no mana, and one that reduced mana regen to zero, but makes one charge of mana potion fill the player’s mana fully?
What about a mechanic to purify mana to give more mana and mana related buffs, such as faster mana regen and a higher mana cap until the effect wears off?