Why Bottles?

The default form for potions is a drinkable liquor in a small glass bottle, like a vintage medicine bottle. The description of the liquid and bottle's decoration can be anything, but usually it still boils down to some sort of liquid-in-a-tiny-bottle. It doesn't have to be though. Instead:

This potion is (in a)… (d20)
1 Perfume/cologne
2 Lip balm
3 Eye drops
4 Snuff
5 Blotting paper
6 Syringe
7 Inhaler
8 Breath spray
9 Gel capsules
10 Lozenges
11 Gummies
12 Juice box
13 Milk carton (individual serving)
14 Can (carbonated)
15 Wine bottle (3 servings)
16 Amphora (12 doses)
17 Lidded styrofoam cup (served hot)
18 Thermos
19 Plastic bag with a straw
20 Honeycomb