We carried our water, I doubt there's much that way that's OK even with a good filter. Filled up our bottles in NB before heading out to camp.
Struggled to get a fill the next morning, Bostocks tap was offline and they won't take bottles or other containers to fill due to COVID. They tried their best, gave us lots of cups of water, huge waste of cups though. Plenty shops in Haddington, though it pains me to pay for water.