I see posts about this subject fairly regularly and wonder how I'm still alive. I grew up rurally and have never had a first flush system or a filter in my rainwater, the house I'm in now has a grill to stop pine needles and that is all. We drink out of puddles and seeping springs while we're hunting as we travel very light. I think if you acclimatize your body it will handle a few bugs no trouble. I'm statistically more likely to roll my quad or tractor at work than poison myself through the water here.
I live in central Florida and am building an off-grid tiny house. Designing a water system has been my main challenge (and main obstacle to moving to the location I intend). Reading this thread has been very informative.
On one hand, I'm contemplating paying to have a well professionally dug, and let that be the end of it, but I would prefer to have a self-built system drawing lake water and using a slow sand pre-filter leading to ceramic filter (such as the Monolithic ones mentioned above).
I'm trying the find the sources to answer these questions.
1. Is my lake, spring-fed (from below, as is almost all of Florida's lakes) and a near perfect circle 660 ft across, large enough to be a good source?
2. If so, where exactly in the lake should I draw from? The center surface? The center below the surface (and how far below)?
3. Where can I find plans to build a slow sand filter suitable to my low-level needs (only one person's worth of water)?