It depends on the bucket being used.
Check the bucket because it might say how many litres the bucket can hold
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one liter is always one liter it doesn't matter if it is in a water bottle or or a bucket
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.
About 10 litres
18 litres
32 pounds