Got these old ice cream tubs from a local ice cream place. $1 for a dozen. I wanted to increase my rainwater storage (currently have 2 rainbarrels). Realized I could stack these guys up as much as I needed. A few drilled holes and a spout off a cracked kombucha kit and bam. Homemade rainbarrel.
This is part of a set of daisey-chained barrels so I had to keep it to 3 tubs for height reasons. All told it only adds about 8 more gallons of storage but every bit helps. You could stack as many as you wanted though, within reason.
I kept it simple but you could also add additional sealing between the bottom-lid connection to limit loss that way. I will add a few extra pictures in the comments.
Radical! I need to remember this for my garden. Finding a large water container is so difficult on a budget. But if I can make one, that's cheaper and saves something going to landfill. hmm...
For sure! You could probably do it with old 10 gallon buckets as long as they stack. Same principle. Then all you need is a bit of waterproof sealant and a spigot.