What does it really take in terms of water and battery
. Like I said earlier it depends on what you think your needs are. We can't answer that. I can however tell what I use. First there 2 of us older folks.
The trailer doesn't have an electric water pump only an hand pump. No shower. All lights
except for a couple CCFL lights
If one wants to really stretch things out you must evaluate needs and wants so that you mostly eliminate the wants and concentrate on the needs.
In our case battery usage depends on the time of year and where. We camp year around. I do have a 65Watt solar panel
that comes out about every 4 days for a day. The battery will last at least that long with night time temps into the mid 40s Much colder and the solar
time has change a bit. The furnace
draws a bit so temperature and approx. furnace
run time need to taken into consideration. Night temps above 55 I have no idea how I can go without recharging. I think I've gone over 2 weeks a couple times.
Water usage. Most of water we use is for coffee in the morning and bit of drinking water through out the day. We need a lot less than when we were climbing mountains with a 60lb pack and 45lb pack (me 60 wife 45).
There are large, thick, body wipes so you don't really need a shower. Hands are cleaned with baby wipes and waterless hand cleaner. The idea here is to find way to keep clean without using a lot of water.
That's what we do and it works well for us, but not for everybody. Like I said earlier there are needs and wants. The wants will always get you. The needs you deal with. You have to determine which is which.