I am rarely found without a cup of tea in my hand. Like, it's gotten to the point where I've nearly fallen out of the habit of using the shortcut-buttons on my cintiq because my left hand is always occupied by a tea cup.
I tend to snack on things that are either neat enough to not leave my hands sticky or messy (so, biscuits and toast and walnuts and stuff), or things I can eat with a spoon or fork - last night, I got through some leftover apple pie while working.
But I usually don't snack that much while working. I drink a ton of tea, but tend to stick to taking breaks for my regular meals, and having maybe one snack in the afternoon between lunch and dinner?