In Bali, Thailand and many other places in SE Asia, you can get water that comes from local treatment plants (it usually looks like this[1]) instead of "brand" bottled water (like these ones[2]), the former is almost always bottled locally (at the nearest water treatment plant, they are ubiquitous in SE Asia even in regional areas, sometimes they are subsidised by governments), as a result the water tends to stay in the bottle for a much shorter time whereas "brand" water is not sourced locally and it travels long distances after being bottled. In addition the employees of the local water treatment plant will often come and take back empty bottles to use them again, so in those cases you have nearly 100% recycling and very little plastic waste.

I don't have any evidence that [1] contains less microplastics than [2] unfortunately, but I think it could be the case.

(I have lived in Indonesia for about one year and part of my family is from Thailand).

[1] http://www.nomad4ever.com/wp-content/uploads/2006/12/bottle_...

[2] https://www.bali.com/media/image/865/plastic-bottles-waste.j...