Sometimes I'll put a bottle or two of water into the freezer the night before. Sometimes I'll even remember to get it/them out the next morning. That's for "organized rides." Stop at the 7-11 for coffee and to fill the bike bottles with ice.
If it's Saturday and I'm meeting the BFFs for breakfast after the ride, I might grab a banana while I'm at the 7-11. Sunday I usually stop at a fast-food place after the 7-11 stop for coffee and ice and have the least offensive option I can find on the menu. Then when I get to my parking place I make sure I stuff a couple of nutrition bars in the trunk bag, top off the bike bottles with water, record my starting odometer, grab the helmet, and go.
If it's what passes for winter in these parts, I'll put on an extra layer or two, as well as the full-fingered gloves. If it's cool but warming up, I'll probably put on the windbreaker and wear the "fingerless" gloves. If it's sunny and warm, I'll try to remember the sunblock.