Farm supply stores carry heavy duty plastic 55 gallon drums with a brass faucet already cut into the lower level when it is in a vertical position. They are used to transport water to remote pastures for livestock.
The one I just bought has Greek Script on it and judging by the interior smell it originally contained olives. Top screws on with rubber gasket. How to get rid of olive smell and taste? Beats me, My few critters don't complain. $32.00, not bad, worth checking out.

Jon