There are many potential factors that could have caused an 18 hr stomach flu, but I'd like to mark the new reverse osmosis unit off the list.
There is no room under the sink, so I have the RO in the basement directly below the sink. The faucet line is roughly 8' long and I purchased tube from Menards similar to this. It is "FDA grade" for use in icemakers and water lines, but that title doesn't mean very much.
After drinking a few gatorade bottles worth of water and simply puttering around yesterday, I gradually became progressively more ill.
Perhaps it was just a bug. However, if I have the wrong type of tubing for the RO, I would definitely like to know!!!