When I took chemistry, the iconic example of ionic bonding was NaCl, sodium chloride, the primary ingredient of table salt. It's single bonded, which is very strong against heat (NaCl has a very high melting point), but weak against water.
Then in my geologic crystallography course NaCl appeared again as Halite. That is naturally occurring NaCl. It has a cubic crystal, and is very simple.
Now, Pepsi/Lay's is going to mess with one of the simplest chemical compounds. Hopefully this will be more successful than Olestra.