You can do a lot with that material if you have experience. Shoot, that would be my surge box in a heart beat. top off container, you name it. But when it comes to water you want to know what you are doing. Accidents happen in strange and bad ways, turning a cool hobby into a nightmare. Especially when it comes to a seem bursting and electrical accidents. So please do the research before attempting to building a container to hold water.
Couldn't be more correct.