Probably the cheapest way is to buy a humidifier float kit from Home Depot and then install it in your bucket. A single hole drilled in the side is all you need to do and then run a separate RO line into it. I did this with my 45 gallon containers and it works just fine. You just need to scale it down some. They are less than $20 bucks if I remember correctly.
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250 gal display tank plumbed directly to my wallet
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