Bike stuff in the saddle bag, specific to each bike. Jersey pockets:
right - paper towel
center - cell phone
left - ID (my old drivers license), card with basic medical and emergency contact info, credit card, some cash. All in a little folding thing to keep together.
if I’m expecting to go more than 45-50 miles, a Clif Bar in the left pocket. For a 70-100 mile ride I might add more food and/or electrolytes depending on if it is supported and/or where I’m going and what services are available.