Replacing the pipes can take years. There needs to be some sort of good medium-term solution. I think it's reasonably feasible to use bottles as a very short term solution while implementing the RO systems for a medium-term solution. It's possible that you could even focus on providing apartment buildings with commercial RO systems for the whole building if the pipes inside the building are not lead. The maintenance is not that much of a concern with the filter life indicators. It would seem the people who couldnt stay up on replacing filters would also not be able to plan for how many water bottles they need, meaning they likely have (or need to have) someone to help them with their life.