Small quantities of anything is the best solution. I give mine chocolate milk sips every now and then, licks of my Coke, a teensy bit of my Bailey's Irish creme whenever I have some. They love granola mixed with yogurt.

Just stick with very small quantities and they should be fine. Large amounts of anything can give them diarrhea, but if you're mixing a tad bit of milk with scrambled eggs, that's perfectly fine.