Plurality voting doesn't work right when there are more than 2 choices.

A couple examples of voting systems that work better.

Please vote for your favorite drink. We'll buy a case of the one with the most votes.

Please vote for your favorite drink. We'll buy a case of the one with the most votes.

Please rank your favorite drinks in order. We'll buy a case of the one that wins.*

* after running a complex algorithm that you can't possibly understand.

Please vote for your favorite drink.* We'll buy the case that makes the most people happy.

* if your favorite can't win, your vote will be passed along to the alternative.

Since there are only two choices, this works fine.

Uh oh. Now the results are unpredictable and probably wrong.

This can work quite well, but can be a bit tedious for voters.

Here is a creative approach that tries to avoid wasting votes while keeping it simple for voters.

Please vote for your favorite soda: