I know it sounds kinda sci-fi, but could an ionising radiation 'clip' be fitted to taps in third-world countries to eliminate some of the effects of bacteria?
Outside United States drinking water
Interesting idea. That technology has a risk associated with it. The time of exposure to the bacteria may not be long enough to kill enough. Exposure to the people in the home may be long enough to cause harm. Some of the radiation may be blocked if the water has any suspended solids. Much like the suspended solids block ultra-violet light in a UV treatment system. Efficacy and safety would need to be proven before it is used with the general public. Safe guards would need to be substantial (fool proof) or there will be someone that will disable safety measures and harm themselves and others.