Have you thought about contacting Louis Rossmann? He created an extensive video guide on how to self host using FOSS. Perhaps he’d be willing to highlight your survey to his over 2 million subscribers.

I also don’t know anyone who uses a Brita filter. I prefer tap water and have never had to boil it but I’ve mainly lived in large cities in southern Ontario, Canada.

However for a few months when I lived in a very small town (< 250 people) and the house I rented got water from a well – at that point I drank only bottled water. The well water turned the shower wall orange so I really wasn’t keen to drink it.

I already saw one user who posted great content including citations – adding user tags is what I miss.