u/Boogerius

With 12.0.5 nerfing water (lol), the teas made from midnight cooking are the best drinks at 8% mana per second. Sanguithorn, argentleaf, and azeroot teas give a speed buff as well (50 rating, roughly 4 % movement speed increase). This buff is separate from Well Fed, it doesn't count as or remove your food buff. It also works in M+.

Of these 3 teas, sanguithorn is by far the cheapest at under 3g each