How often should you wash your reusable water bottled. You are doing your part to save the environment by not drinking bottle water. Well, because you think itâs your own germs and itâs all good that doesnât mean you arenât facing a threat. Experts say that 60 percent of the germs found on water bottles can make people sick. Experts say you should washed each time after you use it. Probably good advice. Read more HERE!