Eat a banana. It is important to keep up potassium levels while photographing. Seriously, if I know I am going to be shooting for something specific, I just bring the proper gear and make sure I leave the house with fully charge batteries and empty memory cards. Otherwise I just shoot when the opportunity presents itself. I don't worry too much about limitations imposed by malls and such, I have yet to run into major problems there.

Kort Kramer - Kramer Kreations