Although i wild camp almost all the time, before now i have gone to a village hall/community centre where i can see an outside tap and asked if i could make a donation in exchange for some water and was delighted with the small amount of money that they were happy to accept.
i also fill up at campsites (many charge £10 for grey/black waste dump and water refill - i think that is well worth it - but i guess many sites are shut right now
most small harbours, where fishing vessels land their catch, will contain a tap - and harbour masters, if asked nicely, have allowed me to take water for free.
Some small harbours may also have showers for passing sailors and those facilities will also have taps.
i see luggingfull watering cans to and fro as a useful form of exercise, especially on days when i am sitting for many hours