Winter training, geared or SS?

Got a race blade type thingy on the back but nothing on the front.

The grey bottle is for tools/tubes etc. Yes I drink from the other although I do it with caution and try to clean it as best I can first. More squirt water in rather than put it in my mouth. The big issue is I'm riding the lanes at night so can't really see the bottle but just have to assume its dirty. Not ideal.

I used to have a bottle with a rubber dust cap, can't find one like that now, but have you considered something like this from Decathlon?