your question is ilegible what do you mean? "how many water" the obvius answer is a galon of water if you want to convert it to liters or any other units find a conversion table
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One quart
If you have a gallon, you only can have one gallon.
Well, honey, it's simple math. Fill up the 9 gallon container, pour it into the 4 gallon container until it's full, leaving you with 5 gallons in the 9 gallon container. Then empty out the 4 gallon container, pour the remaining 5 gallons from the 9 gallon container into the 4 gallon container, and finally fill up the 9 gallon container again. Voila, you've got yourself 6 gallons of water!
Assuming you don't use fractions of the containers: You could fill the 5 gallon container and then decant it into the 4 gallon container until full leaving 1 gallon left in the 5 gallon container. Empty this into another container, repeat the process 2 more times and combine the 3 one gallon containers to make 3 gallons in one.
there are approximately 4 quarts in one gallon and 8 pints in one gallon.