Where can I get a 20 - 30 gallon reservoir tank

I am looking to setup a pretty decent sized hydro dwc here soon, but I am not sure where I can get a good reservoir. I need something that will open up and allow me to add pipes and be able to clean it when needed. Id like something in the 20 to 30 gallon range.

Does anyone have any suggestions?

Buy a Coleman cooler. Best you can get for something that size, great quality, insulated, leak proof, easy drain spout, 100% light proof.

Cheaper option, home depot totes, go up to 45 gallons.

Nice sturdy garbage cans work wonders.

Totes or garbage cans. Depends on how much space you have to put it in.

How simple/hard is it to make modifications to one of those Coleman totes. Like water tight fittings or rather what could I use to connect hose to the drain?

Should be able to put a hose on the spigot if it has one. If not, bulk head fittings are cheap, water tight, and easy to install.

Does anyone know where I can get the parts for this little project. I am going to use a 50 gallon coleman cooler. I went to home depot today to scope out what parts I would need, but that ended in total failure. Those dumbasses have less of an idea than I do about how to do this.