This instructable  stems from my being lazy and my very large dog that drinks lots of water.  I doubt this idea would scale down for a small dog but it works great for for 5 gal buckets.  The photos i have taken are actually from disassembling and cleaning a water bowl that i have used for over 3 years.  This is a pretty simple build.
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Step 2:

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Drill a hole in the side of the tub, so that the diaphragm on the filler sits as low as possible.  For me this was about 3 inches up from the bottom.  I used an old junk 7/8 spade bit.  It would probably help to clamp a scrap of wood to the inside of the bucket, but i was able to punch it though just fine.  Also a file to clean up the edge would help if there are any barbs.

Step 3:

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Simply mount the diaphragm filler in the hole with the diaphragm facing down.  I found it best to use the rubber seal with the kit on the inside of the tub.  Just cinch it down until its tight.
ohbejoyful10 days ago

I would love to plumb this inside my house. Maybe use either the shower water supply (which is currently exposed in my bathroom, sigh...), or the toilet water supply!

sjara1 year ago
This is awesome.
Chef Maki2 years ago
Good idea. I was recently thinking about an idea like this while visiting my sister and her new pup. I was leaning towards using a level sensor and a valve. I wouldn't have thought to use toilet parts. Very cool.
hey, great idea, this might work for our chickens...
Bucket looks yummy. Nice and green on the bottom there.