For trips of six hours or less, snacks and cold water are provided. Additionally, box lunches are available through Gathering Grounds of Patagonia (must order in advance).
Mileage surcharge for using my vehicle: $.30/mile. This applies to all trips, to cover vehicle wear and gas. If I pick you up, mileage starts when I leave my house, but time starts when we leave our meeting place together. If we take your car, I only charge one-way for driving to meet you.
Some remote birding locations, such as California Gulch and French Joe Canyon, result in much higher vehicle stress and much worse gas-mileage. These trips will be surcharged additionally at $20 per group.