When I first bought a 45 gallon storage tote as a reservoir years back I found out that rectangle totes will just bow out under the weight. I thought about building a wood frame around it to support the weight, but I decided to use that tote for the storage of all my hydroponics stuff instead. So I just never got around to it. But if sized right, it should do the trick, and be fairly cheep. I would use 2x3's, they run about $1.87 for a 8 footer here. And you could probably build the whole thing with 4, maybe 5 of them ($8-$10). But if you don't want to go to the trouble, think round containers like trash cans, or used rain barrels. They distribute the weight evenly.
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