Mid 20's? Seriously, it is certainly no big deal at all.
It is absolutely a non issue whatsoever.
Nothing is going to freeze, nothing is going to burst or break.
With the furnace going, keeping your inside temperature at 70 or so, EVERYTHING will be fine. You don't have to do anything.
I just spent 5 weeks in Alberta in November and December, and when it was that warm, (mid 20's) All I did was keep my furnace going and absolutely everything was fine and water flowed. I left my HWT on 24/7 too.
When it got down in the low teens for days on end, I still had no problems at all. Nothing froze. There is enough ambient temperature leaking out of the RV to keep things working.
When I got down around 0F, I started to take a few precautions, but everything still flowed, except my dump pipes.
It was when I got down to the MINUS mid 20's F that I had to be a lot more careful. I had my kitchen water feed freeze up and even though I had a heat tape on my dump pipes, the gate valves ceased functioning. It was at those temperatures that things got a bit challenging for me.
But at the temperatures you describe? Trust me, you have nothing to worry about. No insult intended to you well meaning guys that hit the panic button, but you are seriously over-reacting.
But yeah, like post above, disconnect your water hose if you feel the need. It won't freeze up either at the connection. Maybe in the hose to the tap but thats all.
You don't need to run your water and you don't need antifreeze in your tanks. They are not going to freeze in a couple hours a night. No way! I wish it was that balmy for me when I was in Alberta!
You will be fine without doing anything, trust me on that one.
Been there, done that, got the T-shirt! :)