Since our DS was about 3 mos, I've usually taken him out right after his 1st nap. While he's napping, I get everything ready, so I can pretty much just change his diaper and walk out the door. His sleep/eat routine has always been a bit off... doesn't eat right away... so I just take the bottle (and now, solids also) with us. He's eaten a few times in the dining part of grocery stores. He's had his bottle in the laundromat, library, passenger seat of my car, dining area of Walmart, etc. I've fed him Cheerios while we grocery shop. Once a week, we spend his entire 2nd A time at the laundromat.
Once a month, the library has a 0-24 mos storytime which kinda interferes with 1st nap. I just catch him at the 45 min mark (when he's easiest to wake), we go to storytime, and he gets an earlier, longer afternoon nap.
Hope this helps!
- LisaW