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1 gallon is way too small to hold even 50 of these roaches, 10 gallon is a minimum. I'm using a 40 gallon tub which I bought for 8$ at a garage sale. If you don't want the water crystals, a sponge in a container of water will work but you will need to clean this often. You could offer water filled veggies and fruit, like iceberg lettuce, watermelon, etc. IMO the water crystals are your best bet. They REALLY work. I bought the starter kit, and with it came a small plastic baggy with the crystals, it didn't look like much at all. I pourd 3/4 of it into bowl filled with water, and left it over night. I had about 2 gallons of the stuff in the morning. The stuff lasted me about a year, I just put in a new plate of crystals once a month.