I accidentally sold 20 Sujamma I needed for a Fighter's Guild quest. What's the console command to add these to my inventory?

You can buy them back and the quest will not notice. I do most of the Thieve's Guild quests without stealing from vendors they tell me to steal from. The game doesn't notice where you get the item. It just knows you have the item.

Yeah, I just went and bought some. I just didn't want to go all the way back to town unless I had too.

This is the command you need.

player->additem potion_local_liquor_01 20