From Pikipedia, the Pikmin wiki

Blue juice?[edit]

I noticed that, on January 1st (assuming Day 1 occurred on January 1st), there were 3 cups of juice in Pikmin3. What fruit produced it? The preceding unsigned comment was added by • (talk) • (contribs)

You mean at the night of the first day? Those are the provisions that the Koppaites came with. They initially launched with 7 bottles, but 4 of them got lost. These 3 come from Koppai, and exist to help the player get into the game's world without having to rush for food right on the first day. Who knows what fruit this juice is made of, if it's even juice. Maybe it's astronaut food. — {EspyoT} 15:48, 24 January 2017 (EST)