Water can be supplied by the water company but you will have to pay for it if you have a PWS - see https://www.mygov.scot/maintain-private-water-supply/
People on the supplied water system pay for the emergency water by water rates so are covered when that is necessary.
For anyone wondering about Private Water Supplies here is an interesting document and when you think about it people on mains supplies are very lucky in the UK - See http://www.fwr.org/waterq/frg0007.pdf
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