I don't drink tap water anywhere as I understand you can get an upset stomach even if it's perfectly clean due to different mineral compositions

I then have two categories of 'don't drink the water' countries where I amend my behavior

a) e.g Thailand Brazil, will brush teeth with tap water, will eat salad (likely washed with tap water), will take ice cubes likely made of tap water
b) e.g. India, Kenya, brush teeth with bottled water, no salad or ice cubes