What increases mana?

I'm curious to know, what exactly is it that boosts or increases mana? Is it a specific type of food or drink? Could it be a certain type of training or meditation? Or does it involve some sort of magic spell or potion? I'm particularly interested in understanding what elements or practices contribute to the enhancement of mana, as I've heard it plays a crucial role in various mystical and magical practices. Could you please elaborate on this matter?