For those who don't have a cat, try contacting your local animal shelters and rescues. They probably have lots of these jugs. The larger square containers make handy totes and nesting boxes. I have one by my outside faucet to use for spot watering.We also planted many tomato plants yesterday. Around 33 plants. If you want jugs - maybe start to collect these type:
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This is something we buy at Walmart. But I’m sure other things are in this style container. It holds closer to 2 gallons it seems - I can fill up a 5 gallon chicken waterer (nearly empty) to close to top with 2 of these. Bottom flat, plastic a bit heavier than milk jugs, but bonus is the wide opening. Label is a plastic tube so easy to remove and have a plain white jug.
(not my boxes)