We drink form our tank and clean it if not used for over a week or two with no issues. The military drink for large trailer sized tanks and have done for years.
We also carry a 20l clear jerry can that we drink from for the first couple of days after a clean if the tatse is bad and also to fill up the van if we cannot be bothered to move it on site.
We used to use bottled water however I will use this anlogy of milk (which is accurate for the town we live in) on why we no longer do -
As a family of four we use approx 16 pints if milk a week, so on average 4 pints each.
Our town has approx 25,000 residents, so 100,000 pints of milk a week.
Assume that's a 2 pint plastic supermarket bottle.
Would mean just one small town generates 50,000 plastic bottles of waste every week that either goes to landfill or has to be paid to be recycled.
I drink a minimum of 3 pints of water a day year round, more when it's hot or exercising, which I do a lot from the van. If every van used bottled water the waste burden and associated costs (direct and indirect would be massive).