Josie takes the address and trades it for his food, that was sitting there waiting for him to eat. It's the caretaker in her - that plus it would be a waste of food. While he eats, she will search the address on her phone to see how far they have to go.

"Doesn't look like it's too far from here. We can probably make it on foot." And by on foot she means not needing to hop on the subway to get there.