I've got mudguards see the picture there <----
I find on the cow-shitty roads, the bottle on the downtube is fine, but the one on the seat tube gets gritty. So I just got two bottles the same, and when I swap them over (I can't reach the seat tube bottle easily) I swap the lids too. This has worked fine so far.
I used to row on the Thames tideway, that is down stream from an often-overwhelmed sewerage treatment plant. Lids were vital, if you didn't want to get e-coli that is.
(I hope
@Citius insists on ordering pig and cow in restaurants. Beef and pork definitely entered the language via pseuds wanting to separate themselves from the hoi polloi .... are greek roots acceptable, or do with have to stick with strict saxon? Edit: no, saxon is a german language, right? I need some guidance here.)