Reply #4: It sounds like the sewage treatment plant capacity is the issue, [View All]

and NOT the water supply. So here's what I would do if it were me:

Only let water go down the drain that HAS to (toilets). If there is ANY way to "divert" other water or delay its discharge into the sewer, I would do it. Your dishpans of sink water especially can be dumped outside to soak into the ground (I am thinking this MIGHT be a problem, lol, if the ground is already completely saturated). Definitely don't flush toilets unless they have solid waste or are full of TP (go easy on the TP). Load kids up into the bathtub in sequence, cleanest to dirtiest, then haul the tub water out to the yard in buckets.

This is temporary emergency stuff I am recommending. Do what you can. It won't last forever, and you can reminisce about it afterwards.....