Okay they did an info dump about all the foods, so I'm sure that plays into the alibis as the pattern usually goes.
My current predictions:
- Kousuke (the guy) will be very heavily suspected because his coffee is lukewarm, so people will paint that as him being here early. He was also the first one at the building. However, he's probably innocent because he's also the most obvious
- Shouko (long haired lady) will be considered suspicious since she got ice cream and she could've just shoved them into a freezer to make them cold again. There is not much other info to play into her, so perhaps more will be added for her next chapter that tips the scales towards her.
-Mina (short haired lady) is most suspicious. Her alibi will be that the bread is still warm, but there will probably be something about warming the bread up and the reason the 'oh-so-important' curry bread is not present is because something specific happens to it that would make it obvious she warmed them up later.
....again, this is all just speculation