I'll never leave home without water again. The one and only time I did, we had one heck of a time finding any. We use city water in our LQ which means an extra stop but our well water has iron in it. That turns the shower, toilet, etc. rust brown and takes a lot of scrubbing to remove. The live people/critters drink it fine.

My trailer is a 24' combo stock and the front "stall" is for bagged hay, tack, carriage, critter water, etc. For my horses, I have several 15 gallon barrels that are food grade. The lids are like a canning jar... a more or less flat lid with a rubber ring seal, and a ring that holds the lid in place. My husband mounted an RV waterpump on one of the lids, along with a long small diameter hose. It has a multi spray nozzle on the end. The power cord for the pump is long, and plugs into my pickup trailer plug. I can rinse off a horse, fill water tubs, wash my carriage, rinse off myself, etc. I just switch the one lid to a new barrel when out of water in one.

I am planning on a heavy duty metal shelf in the "tack" area with milk crates to hold things. Bungie cords to  hold the milk crates in place, and will secure the shelf to the wall so it says upright. Not positive how I will do that at this point in time. I want to have the option of hauling horses in both livestock areas if I should so desire.

I recommend putting the non-slip shelf liners in all your cabinets to help keep things from sliding around. 

I agree with keeping doubles of household things in the trailer and make them all a very distinct color so they won't be mistaken and left in the house (like orange kitchen things, bright yellow towels--just something very different than in the house).  While we're speaking of duplicates, get a phone charger to leave in there.  I also keep a small coupon file folder that put duplicates of important documents--truck/trailer insurance, health insurance cards, coggins plus contact numbers in case my phone dies or gets stolen, purse is stolen, etc. (home vet and doctor, close friends and family, credit card company, bank).  Along with that, I recommend keeping an envelope with a couple hundred dollars cash hidden somewhere.  That emergency fund has come in handy a lot!!!

Designate a "junk drawer" for extra batteries, tape, notepad and pens, lighter, a candle, safety pins, etc.   Think about using disposable plates, cups, silverware, crockpot liners--it can be awfully tight quarters in an LQ to wash and dry dishes for a small family.