I would definately get a brute. I have used them for awhile now and they work fine.
If you are just needing a water storage container, you can use anything that has a tight fitting lid. Just get a plastic float valve, drill a hole for it, fit it on the can, attach your water line. Then, drill a hole in the side or the bottom so that you can easily drain it. Use a bulkhead and a ball valve for sure.
If you are doing water changes, it is relitively easy to just use a mountain spring bottle or something of the like.
I mix about 50 gallons of saltwater at a time at home for water changes and use two brutes with the same setup as what I am talking about.
Good luck to yah!