Live.American.English

Idiom: get your feet wet 👣

= to begin doing a new job, activity, etc., in usually a slow and simple way in order to become more familiar with it

She got her feet wet at her new job by doing some simple filing tasks.

http://www.learnersdictionary.com/definition/wet

In the Democratic Presidential Primary Debates, Cory Booker said, "You're dipping into Kool-Aid and you don't even know the flavor." This means that you don't know what you're talking about; you don't know the facts of the situation.