This flask comes in 4 sizes: Small, Medium, Large, XL
Unlike potions, which typically come in single-use vials, it's always hard to tell exactly how much liquid remains inside a flask - you never know quite how many uses you'll get before it's all gone.
The Flask Die
Instead of tracking individual drinks, the flask quantity is measured with a die - d4, d8, etc.
Flask die - roll it whenever you take a drink from the flask: if you roll a 1 or 2, the die gets 1 size smaller: d20, d12, d10, d8, d6, d4
Once you roll a 1 or a 2 on a d4, that's it - the flask is now completely empty until you find a way to refill it.
Small - Flask is full with a d8 size
Medium - Flask is full with a d10 size
Large - Flask is full with a d12 size
XL - Flask is full with a d20 size
Filling Your Flask
If you have an empty flask and are proficient with an alchemist's kit, you can fill an empty flask yourself by combining together potions of the same type and pouring them safely into the flask. This can be done during a short or long rest.
If you don't have the requisite skills or experience, you'll need to find an alchemist to perform this service for you. To refill your flask it must be completely empty, mixing potions, even of the same type cause the contents to spoil and lose magical properties.
Cost to Fill
d20 - 22 x [Base Potion Cost]
d12 - 15 x [Base Potion Cost]
d10 - 10 x [Base Potion Cost]
d8 - 6 x [Base Potion Cost]
d6 - 3 x [Base Potion Cost]
d4 - 1 x [Base Potion Cost]
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