Juice in glass container (better for the environment) with a straw.
When it was time to go, she just bent the top part of the straw down so that it would fit into the mouth of the bottle just enough to close it.
And off they went.
BRAVA!!
An homage to the nameless, faceless many who invent and develop on a daily, hourly, moment-to-moment basis those phenomenal little things that save us from crisis/meltdown/tantrum/migraine, if only for that single moment. I may not always know who you are, but, doggone it, you're special, and people like you.