The average soda can holds 12 ounces of soda but there can also be smaller soda cans as well.
But if you have 12 ounce soda cans then it would take 10 soda cans to make 1 gallon of soda and also 1/2 of another soda can.
So you would need 10 and 1/2 cans of soda to make 1 gallon of soda.
There are 128 ounces in 1 USA gallon.
So to figure out how many cans or bottles of liquid you would need to make 1 gallon take the amount of ounces in the container and then multiply it by different numbers to get your answer.
But if you have 10 and 1/2 cans of soda that are 12 ounces each then you should have 1 gallon of soda.