If you have a riding mower or ATV, you might consider this cart. The handle turns around to enable you to hook it to a hitch. I use mine for everything. Hauling hay, manure, yard debris, and tools when I need them out around the place. Washable, dumpable,
http://www.homedepot.com/p/Gorilla-Carts-1-200-lb-Heavy-Duty-Poly-Dump-Cart-GOR6PS/206762395
As I only have one horse at the moment, I use a muck bucket for water. It’s close enough that I just run a hose to it. For me, this works as I can tell if she is drinking and it’s so easy to dump and clean as needed. I have a scrub brush hung on the fence nearby so that is there any time I need it. If you use a larger water trough, most of them have a drain plug. Set the trough so that the drain plug is away from equine feet (maybe toward the fence) and replace the drain plug with a shut off valve or spigot. No wrench needed if you need to drain it and you aren’t trying to turn over a trough with a lot of water in it. Water weighs over 8 lbs per gallon so even a 50 gallon trough can be a wrestling match for a smaller person. Nor do you end up with shoes full of water.
My mare has a canopy for a dry place to eat until I can get something more substantial built so I have a Rubbermaid container with a lid near the gate that has a couple of groom tools, fly spray, hoof pick, and thrush buster in it so these bare essentials are close at hand. If your barn aisle will tolerate a small bench then Rubbermaid has a bench with storage. There is no such thing as too much storage with horses.
http://www.rubbermaid.com/en-US/patio-storage-bench
This thing is a lot of $$$ for me at this time but I sure do want one.
http://www.sstack.com/Stable_Bathing-Necessities/Insta-Hot-Power-Max-Portable-Washing-Systems/
One barn I boarded in had a couple of tack hooks hanging in the aisle. Convenient and useful but a bit in the way when a truck needed to pull into the barn, Then came Clementine, the pet goat. It became a challenge to keep everything above the goat line. This discerning caprine knew that the more expensive an item was, the better it tasted. That $200 headstall left hanging on the tack hook became goatmeal. I purchased 2 pulleys, an eye bolt and a rope cleat for each tack hook and some ski rope. I mounted one pulley to a rafter about 5 foot from the wall. The other I placed near the wall. I tied one end of the rope to a hook, ran the rope through the pulleys. On the barn wall I put in the eye bolt and ran the rope through that, then knotted the rope so it could not slip back through the eye bolt. I attached a rope cleat below the eye bolt to secure the rope to. The tack hooks could then be raised or lowered as needed. Everyone was happy but Clementine so she promptly ate someone’s coggins papers and stole a check from the farrier.
I hope some of this helps. And remember: Keep it above the goat line!
OOPS!
) You could try the muck bucket cozies for water situations in the fields.