The important thing is to realize that you'll need to wash your object with soap and water beforehand; bacteria is invisible, and you don't want to introduce any into your orafices.
Using food also isn't the greatest idea, as food is much more likely to have rough spots which can rip your flesh or a condom. You want things which can be cleaned before and after every use.
Use your imagination; whatever you pick you should probably set aside - under your bed? in a drawer? - just for the purposes of masturbation. It's handy because if someone sees a hairbrush by your bed, they won't get suspicious.
If you want to find objects for clitoral stimulation (rather than a penis substitute), shower heads, running water, or electric or battery powered personal massagers are dandy.
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