Approx 200000 ml.
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.
100 gallons :P
That is about 642 cups
You would measure the volume of a bathtub in litres (L)
A standard domestic bathtub will hold about 80 gallons of water.
500 pints is 62.5 gallons . -An average bathtub would hold that easily.
1 tsp = 5 ml
more than 2000 mL
One cup = 250 mL.
Personally neither as I would use gallons, but to help you think about it:If you had a bathtub which would be easier (and quicker) to measure it if you used your choice to fill the bathtub with water:a teaspoon (used for taking medicine) which holds 5 ml; ora jug which holds 1 l[The answer is litres (l), not millilitres (ml).]