Sourdough starter hydration

I currently have an established healthy sourdough starter.  It's in my refrigerator and I feed it once a week.  The feeding have been 2 ounces of starter, 2 ounce of water and 2 1/2 ounces of flour.  I'm not sure what hydration that is.  What ever it is I need to change it to 100% hydration for a recipe. 

I'm not sure how to change it.

Thanks.