The drinks recipes are glitchesd in guild stores and everything currently shows up under food recipes.
Senche single malt DOES drop from writs, or from any location recipes drop if accessed by a rank 5 provisioner.
But they're rare from writs, and here's why:
Chance of purple recipe in wrong reward: about 5%
Chance it's a c150 recipe vs c160: about 15%
Chance it's a drink and not food: about 40%
= 0.3% chance (1 writ in 300) of pulling c150 purple drink recipe. There are four recipes, so the odds are something like 1 in 1200...except I think they're higher because I think the recipes are set to have different rarirites. Orcrest pale ale is far ,ore common than the others.
You can find them in guild stores, but because master writs ask for c150 items and becUse they're rare, the current price on PS4 NA is 75,000-125,000 per recipe.
Chance it's a drink and not food: about 40%