So far I have one 55-gallon drum and several cases of bottled water. I bought the drum new since I was concerned about previous contents of a used one. I kept the box the drum came in and flipped it upside down over the drum to keep sunlight out and it's sitting in the garage.

My immediate plan is to add a couple of LCI 5-gallon jerry cans and a few more cases of bottled water, then soon another 55-gallon drum. Then add another drum every so often.