Start by soaking the bottle in warm water with small amnt of bleach. Leave it for a while, then scrub. Rinse. Put Tb of baking soda in bottle, top with hot water and let sit overnight. Rinse and wash as normal. Dry in sun/drip dry.
CamelBak® All Clear Microbiological UV Water Purifier, Water Purification, Survival & Navigation, Hunting : Cabela's I would get one for each member in the household if there was a hurricane, tornado, or earthquake.