I need 65 smithing for Devious Minds, so my plan was to train it to 63 (now 62) and then drink a dwarven stout (m) to get 65. But is there any way to obtain another dwarven stout (m) after the quest Forggetable Tale of a Drunken Dwarf?

I dunno if it is the same thing, but Falador Pub sells dwarven stouts

Falador pub stouts are just normal stouts (+1 mine and smith).

 

I believe members can brew them though, but they are hard to acquire. Its probably easier just to mine up another lvl.