Avoading Re-Winterization

Morning all.  I am new to RVs and we just purchased a used 178.  The original owner just had it gone through and de-winterized.  That's great, but I drug it home, and it looks like it's going to be hovering near 32F here for a low two nights this week (right now forecast is 32F Fri night, 33F Sat night). I would really like to avoid re-winterizing just to turn around and de-winterize again.  I'm hoping these will be the last real cold nights and after that we're out of the woods.  When he was showing me everything, he opened the gray water drain and water came out, and you can see water in the toilet, so there is water in the system, but the gauges all show empty.  Anyways, I was thinking about plugging it in and turning the heat on say 65 or 70 overnight, would that make sure nothing freezes? I could make sure everything is fully drained. I have a little air compressor too so I could try to blow the lines out although I've never done it.  Could I put a little antifreeze in the drains to help? Advice greatly appreciated!

What podrunner said.  32F is an actual line in the sand, so unless it's well below 32F for a long time you will not see any freezing.

Even something as simple as an incandescent lamp placed close to the water lines can help prevent freezing.

With the temps you are talking about, you should be fine.