Get through a whole day in the city spending nothing

The Recipe

1. Leave the house with your card and cash left behind on purpose and the water bottle full.
2. Walk instead of taking the first bus, and keep walking as the default all day.
3. Make the free rooms your anchors: a library, a museum with no charge, a covered market, a grand hotel lobby.
4. Refill the bottle wherever there is a fountain or a tap you can ask for.
5. Solve lunch without spending: eat what you carried from home, or take the samples a food market hands out.
6. Go to a view that costs nothing to stand at.
7. Say yes to one free thing you would normally have paid to skip: a talk, an open door, a public gallery.
8. Walk the whole way home rather than spending on the last leg.
9. Write down what you would have paid for and did not miss.