I’ve found that packing a soft cooler and several ziplock bags can come in handy especially if you don’t have a fridge where you’re staying. I’ll go to a grocery store and buy some drinks and fruits and other snacks. And sometimes use the ziplocks to hold ice for the cooler.
Eating breakfast and having my coffee in my room before setting out for the day saves money but especially time. Can also mean less grumpy people in my group.