BBC Scotland this morning has

A prolonged period of dry weather has left some river flows in the east of Scotland among the lowest on record. The Scottish Environment Protection Agency (Sepa) said it meant a number of sites across the Borders, Angus, Aberdeenshire and Fife were expected to move into “significant scarcity” in the next few days. It would allow them to introduce “targeted and temporary restrictions” on water abstractions to protect rivers and wildlife.

How much fresh water does Scotland have?

Scotland’s Loch Ness alone contains 7,452 million cubic meters of water, which is more than the combined volume of all lakes and reservoirs in England and Wales.

https://www.environment.gov.scot/our-environment/water/scotland-s-freshwater/ https://www.nature.scot/landscapes-and-habitats/habitat-types/lochs-rivers-and-wetlands/freshwater-lochs

England and Wales, by contrast, have far fewer natural lakes, with reservoirs like Rutland Water (12.5 km²) and Kielder Reservoir being among the largest, but their total volume is significantly less than Scotland’s.

http://www.fao.org/3/T0798E16.htm

Scotland’s water reserves are estimated at 5,500,000 litres per person, compared to England’s 134,000 litres per person, highlighting a vast disparity due to Scotland’s smaller population (around 5.5 million) and abundant resources compared to England’s larger population (around 56 million). Scotland is often cited as having around 90% of the UK’s freshwater resources, largely due to its extensive loch system and higher rainfall (averaging 1,500–3,000 mm annually compared to England’s lower averages, particularly in the south).

https://www.studycountry.com/wiki/does-scotland-have-more-fresh-water-than-england

https://www.thenational.scot/news/19515230.big-corporations-could-make-scotlands-water-next-oil/

Globally?

According to the US Geological Study, there’s around 1 200 to 1 500 litres of drinkable accessible water per person globally: https://www.usgs.gov/faqs/how-much-natural-water-there

Scots have around 3 666 times as much.

What could we do with that?

What it be immoral of us to sell it? The only country to ever not sell it valuable resources?