How much water to carry.
Fresh in, gray out, and the handwash your inspector will look for, sized from the number of drinks you actually pour.
Your service
Drinks in a service day
A steady market day runs 60 to 120 drinks.
Rinse and cleanup, gallons
Pitchers, portafilters, tools through the day.
Handwash, gallons
Most codes want a dedicated 5 gallon minimum with warm water.