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.
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800 bottles
Since 500 mL is half of a litre, 800 mL is more than half.
To combine 2.5 L with 800 ml, you first need to convert both measurements to the same unit. Since 1 L is equal to 1000 ml, 2.5 L is equivalent to 2500 ml. Adding 2500 ml and 800 ml gives you a total of 3300 ml. To convert this back to liters, you divide by 1000, resulting in 3.3 L when rounded to one decimal place.
800 millilitres = 1.41 pints (UK)
Assuming that you are asking does a bathtub hold 350 ml of water: 350 ml of water is not very much water, a typical water bottle that you hold in your hand has more than 350 ml of water in it, so a bathtub big enough to hold a person will hold many times that much.