Acquire two sodas of like type (I used Rasputin Kvass)
Place each soda in a separate slot in the same inventory item (Two back pack slots)
Drink soda 'New'. (The newly acquired soda.)
Move soda 'Old' (The original can in your inventory.) to the prior location of soda 'New'
Attempt to place an item in soda 'Old's prior location and observe as you are unable to do so although the slot is empty