'One of one' bottle haha I love it. I used to use a sports bottle that had a flip-up spout, the hole in the spout was just big enough to firmly hold the overflow hose..make it work and keep drivin'!
I prefer the correct ones as well, but they end up being pricey.I’m hung up on the 2 ear cap that I remember Ma using. Can’t find one. Finding only NOS for $27.