Personally I wouldn't put any in their water bottle... you'd have no idea what they're getting. The normal vitamin C dose is here - http://www.guinealynx.info/scurvy.html - you'll have to do some maths depending on what you buy.
Oh, and just be careful of the effervescent ones... they contain around a gram of Vitamin C which is a HUGE amount. Not to mention the sweetener which is a pretty strong laxative.
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