If I needed to extract at home, that’s what I’d do.
Buy everclear.
Put in freezer.
Dump over cannabis.
Recover as appropriate.
This might be worth a read if you want to use iso.
Regarding water content, we did a bunch of research on ethanol extraction many moons ago that showed that having a water fraction in the solvent was actually beneficial. I wouldn’t be surprised if iso turned out the same.