I like that. It’s pretty common practice around here to fill bathtubs when expecting ice storms, severe weather or when anyone even hints at working on the water system. Our water’s bad enough that we have to filter it from the tap, so a portable water filter is standard equipment. I wonder how hard it would be to incorporate a water filter into the inlet to keep the bladder from accumulating gunk from the water.
Got a couple of clean, food-grade 5 or 6-gallon plastic buckets with lids? $30 on this one [video and description at the link]