re: Y'all ever pre-make a batch of old fashioned

For something like an old fashioned you can basically just multiply up. Where you can get in trouble is batching cocktails with citrus.

So let’s say your go to old fashioned is a bar spoon of simple, 2 Oz bourbon and a few dashes of bitters. Just multiply that out.

Now one other thing to consider is add a bit of water to your batch to account for dilution of a mixed drink.

Then set out orange peels, cherries, etc for folks to garnish.