I'm a retired electrician and over the years I've installed many fire alarms, the cable has to be Pyro or FP200.
FP200 being the easiest and cheapest to work with, and as a bonus it comes on plastic reels, so I kept a few of the reels.
Our motorhome is A Mercedes Hymer B680, and it has quite a large "garage", I'll cut the story short as you'll see from the attached piccies.
The top hose is 30 mtr and IS for fresh water only, (I also have a 5mtr hose as the garden hose does not reach the moho) the bottom hose is for grey water only, about 15mtrs long, we generally only visit site's that have ehu, fresh water and grey water drains on the pitch. I also carry a new 10ltr watering can for emergency fill ups.
I also carry a 15mtr flat hose on a reel, sometime's easier to use that, I generally disconnect it from the tap, walk away and the roll it back up, out with the water.
EXCELLENT TIP BY THE WAY TO RUN WATER THROUGH THE HOSE PRIOR TO FILLING THE TANK.
Please excuse the mess as I'm in the moho at the moment carrying out maintenance, and I use the garage as a store during this time.
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