Food Sketches 02

I didn't bring my scanner with me so I'm using a webcam. I can't decide between getting a portable watercolor set, watercolor pens, or watercolor pencils and a brush pen with a water reservoir. I want something unobtrusive I can pull out while at a restaurant or during a meal, but will give me a range of colors and hues. Watercolor pens seem the most convenient option but I don't want to be limited by only two or three colors. The pigments doesn't blend well so I can't get away with blending primaries to make more colors.