Pour boiling water from a kettle through it and itll get clean enough. If you use fresh water every day, it gets continually rinsed anyway.

Just dont fill it with minestrone.

Quote from: M3ta7h3adMy mate swore by miltons sterilising fluid to clean out his platty. Presume camelbaks would benefit from the same treatment

Its basically a bleach for babys bottles, also widely used by amature beer brewers/winemakers..