You need 4 inch pvc pipe and and those deli cups https://www.webstaurantstore.com/cho...RD16WBULK.html
I don't recommend attaching those to your tubs if you want to be able to provide a good cleaning, (unless you have tubs with molded cup holders dirt, poop etc will get everywhere and will be hard to clean)
Pipe and deli cup are not full proof some animals still manage to tip them over (rare but it happens)
You can re-use the cups and replace as needed.
I have use all type of water dish over the year including pvc pipes and honestly the only full proof dish are stoneware dishes or those https://www.dollartree.com/round-pla...-975-in/186283 and it's a one time cost not something you dispose of and have to replace.
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