There may be nothing worse than being in the middle of a hot run or ride and you take a drink from your bottle and…ptooey!!
It got moldy because it has a small opening or it’s a weird shape which keeps it from drying completely after you washed it.
Well there’s a very easy way around this. Don’t even bother putting your bottles on the drying rack, just stick them in the freezer after washing and leave them there until it’s time to fill up and hit the road/track/trail again.