It depends on many factors. Some of them are:
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You will need a maximum of 11,230 gallons of water.
Gallons of what? Different substances have different weights, so you need to be specific. If it's water, then you need to specify if it's salt water or fresh water, since they don't weigh the same.
To fill it all the way to the top you'll need 18,502.4 gallons of water.
About 30 Gallons
4 ounces. 2.5 is 1/8 of 20. So 1/8 of 32 ounces is how much you need. 32 divided by 8 is 4. You need 4 ounces.