Kaigan-kittles

Kaigan-kittles is a candy brand,  likely parodying the real-life equivalent,  Skittles.

The name is a clear reference to Kaigan, a district in Karakura.

Its existence is evidenced by one of the possible messages that appear after doing /feed or /eat.

"You grab a pack of Kaigan-kittles from your bag. You enjoy their fruity and chewy flavor."