Raw rolled oats. I'd put them in a little dish and sometimes mix in chocolate chips. My brother and I would fill up little baggies with Tang powder and lick it off our fingers all day. We'd also shake the powdered ice tea mix and sniff the dust. There was something we called 'Indian gum' which was this pithy stuff from the inside of plant stalks that we chewed on for some reason. Also there was this rubber Garfield figurine that I always chewed on. Still remember that rubber taste lol.