If water, it is the same number in ml or grams.
800 ml
800mL equals 80cL
About 4.7 800-mL bottles.
800 ml = 27.05 US fluid ounces.
800 mL = 0.800 liter
800mg is how many ml?
Each cubic centimeter equals one milliliter; so 800 cc = 800 ml
It depends what proportion of the 800ml is water. For example if it is only half water, then there is 400 ml of water in 800 ml. If you want it in some other units (eg litres, imperial gallon, US gallons) which you understand then tell us what units you want it converted into and we may be able to help.
800 ml
800 millilitres = 1.41 pints (UK)
800 mL is about 0.846 US quarts.