Watermelon strawberry slushies

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This recipe looks super yummy for summer. We always throw out part of the watermelon because it never gets eaten so these are great.

The answer to my grammar confusions

I never was 100% sure on how to write the plural form of Davis.  I finally realized I could look it up today on the internet.  When a last name ends in a "z" or a "s," you add an -es to pluralize it.  I previously thought by putting an apostrophe at the end could not only signify the possessive form but also pluralize.  Now I can no longer embarass myself.  Here's a nifty website to use as a reference:

http://grammar.quickanddirtytips.com/grammar-greetings.aspx

How can I be