Well I kept the bathroom door opened while I was gone (just came back) and water is running normally.
To the guy who told me to insulate the wall&pipes: Yes I did say several times I'm doing that in the summer
said by telco_mtl:
please tell me you are heating the garage? in this weather if you dont heat an attached garage you will get floor heaves, cracks and the like.
I believe that only applies to garages at the same level as the basement.
My garage's concrete slab is at ground level.
Considering my house is 46 years old and there was no heating in the garage throughout that whole time, I doubt the floor will change.
Anyway when the basement is finished (spring), I will get around to the garage, I want a laundry room in there so I will insulate most of it.