I am unfamiliar with the "lake system". I did something similar with a houseboat, setting up a 2 stage filter between the lake and the holding tank. We used this water for gray-water applications only. We would carry-on our drinking water (mostly for coffee and ice cubes). I did get into a pinch for fresh water once or twice and did ingest the filtered lake water....I couldn't tell the difference, although this eleventh finger has made buying good gloves difficult.
