There's a water fountain at my gym that also has a sensor at the back for bottles. You hold the bottle upright in front of the sensor and the water comes out a tap directly above it. But there is also a regular water-fountain spigot in the front.
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On Saturday I did a ride in the rain. I thought about this thread every time I took a drink from my water bottle. Yesterday and today my stomach has felt kinda queasy. Nothing serious, just enough to make me think about drinking from that water bottle in the rain. I'd do it again, though. I think.