Use a pomme frite.
Depending on your respect for germs you might not want to eat it afterwards; but the taste should be about the same.

I have only tried with hot or luke warm pommes frites but see no reason why it should not work with a cold.

You can make them at home or buy them at a shop; then keep them in a small box in a pocket. Make sure the box is tight and does not leak oil though, as pommes frites are quite oily.

You can reuse the pomme frite several times (there is no need to estimate how many times you go up and down in the elevator every day and cook before hand) so unless you plan on travelling vertically for many many times one pomme frite a day should work. If you should happen to wear out your pomme frite there is often a shop nearby (ysc may vary)* to purchase a new.

Finally, if you are sensitive about your health. The best thing you can do is probably taking the stairs anyway.

*)Your Size of Community

Use a pomme frite.

I have only tried with hot or luke warm pommes frites but see no reason why it should not work with a cold.

You can make them at home or buy them at a shop; then keep them in a small box in a pocket. Make sure the box is tight and does not leak oil though, as pommes frites are quite oily.

You can reuse the pomme frite several times (there is no need to estimate how many times you go up and down in the elevator every day and cook before hand) so unless you plan on travelling vertically for many many times one pomme frite a day should work. If you should happen to wear out your pomme frite there is often a shop nearby (ysc may vary)* to purchase a new.

Depending on your respect for germs you might not want to eat it afterwards; but the taste should be about the same.

Finally, if you are sensitive about your health. The best thing you can do is probably taking the stairs anyway.

*)Your Size of Community