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.

Step 1:

Components:
Galvanized tub (about 5 gal)
Diaphragm style toilet bowl filler
12" toilet bowl supply line
brass garden hose female fitting with 1/2 male barb
1/2 to 3/4 inch hose clamp

Tools:
Power drill and 7/8 bit
knife
screw driver

Step 2:

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:

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.

Step 4:

Take the supply line and cut off the compression fitting. Then slide on the hose clamp and work the barbed fitting into the cut off tube. Its a pretty tight fit so it takes some work. Tighten up the hose clamp to hold it in place. Screw the plastic end into tub and the brass end into a garden hose.

Step 5:

Turn on the water. when the bowl gets close to full use the adjusting screw on the valve to get the water level just right. With a little tweaking you can get the bowl to fill right to the edge without overflowing. I will go out once a week and tip the bucket over just rinse it out and get all fresh water but other than that i never mess with it. 3 years and still working great!