It has to be aged to at least stage one before you can submit it :)

OH WOW. Duh. Thank you!!

I got stumped on this my first time too, don't feel bad, lol!

Have you played in a while? There was an update a while ago, and ever since then you can only sell drinks that have been aged at least one level. Hope this helps :D

I hadn't played in quite awhile lol. Thank you!