I'm trying to think what a fork would be analogous to.... maybe a water molecule that binds reversibly to the functional group, such as OH. The parts of the body are not permanently changed when you pick things up, put on your shoes, etc., as is typically the case in a chemical reaction. Hehe... let your shoes represent H+ ions dissociating from your carboxylic acid "feet," maybe! After all, we take our shoes off, put them back on, back and forth, kind of like a weak acid dissociation. 
We often grasp our own hands together, and we shake hands with the hands of other "molecules" (people). Hydrogen bonding of OH groups can be like that too, intramolecular and intermolecular H-bonding.
I'm still trying to think of a good human analog to an oxidation reaction, other than chopping off the toes... sounds kinda painful!  Maybe trimming your fingernails or cutting your hair.
For the second part, those examples sound fine. You can also use rubbing alcohol, which is isopropyl alcohol. Acetic acid is water-soluble, due, as you say, to strong intermolecular hydrogen bonding between the acetic acid molecules and the water molecules, just as alcohols do.
Steve
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