My DD has used the Thermos funtainer (a little larger than the foogo) daily through pre-K, K, and now 1st grade and it does not leak (though she has to be careful how she puts it in her backpack because it WILL leak if the button is pushed and the top opens) and truely stays cold ALL day so she has cold water for both morning and afternoon snack. If you use super cold water and put in an ice cube or two, it can actually stay chilly for like 12 hours!
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As for the straw/spout part... we have had to replace this 2x over 2+ years. I don't think DD chewed it, I think it got worn a bit where the straw is pinched by the lid (which makes it not leak). Anyway, replacement straws/spouts are only $1 (bought over the phone from the thermos company) so I just ordered 3 replacements for her funtainer, plus 3 replacement straws/lids for DD2s foogo, AND 2 extra lids/spouts for DD3's foogo sippy cup...and it cost $15, including shipping.