Anyone know of a source for something like this?

I'm looking for a tube that the diameter is bigger then a pencil, but at the same time securely hold liquid. Ideally, I would like to be able to customize the length, but its not a deal breaker.

Google searching keeps bringing up the Keep2Go tubes!!!!

ideas?
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"One should not increase, beyond what is necessary, the number of entities required to explain anything"
William of Ockham (1285-1349)