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How to stop rim of water bottle becoming smelly?

I have a water bottle that I use pretty much every day. Admittedly I don't wash it all that often just purely because I don't feel like it / forget when I am home and just want to relax.

I have noticed that after a while the edges of the bottle begin to smell a little funky, probably a mix of saliva and water drying and becoming smelly. I was wondering if anyone has come up with an easy way to stop this apart from the obvious "Wash it.".

I know that washing it will fix the problem and I will likely do this but I was interested in any other solutions to get rid of the smell or even prolong the time before it starts to smell!