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>I just really dislike the idea of defecating in clean water that could save a life.

Doubting that THAT EXACT water would save a life ;-)
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>If anyone has ideas, I'm interested in hearing them.

While probably totally uneconomical, buy a house, build a cistern, buy a pump and defecate into rain or used water. You might have to raise your income above 99% of world to survive such task in the US. Which would be neurotic from my POV as no life would be saved by the effort, just emotional hangups stroked with unproportionate effort.

Or get over the water thingie, decide for yourself how much self-flogging you need, work that amount of time and send the money off to some cistern-building or water-purifying group for poor countries to get a clean conscience.