Way to Deserialize JSON from HttpWebResponse without 3rd party frameworks

I’m trying to keep from depending on open source or third party libraries such as Json.NET to parse incoming JSON from an HttpWebResponse. Why? Because the more reliance on open source frameworks to aid in your implementations, the more your app has to rely on those dependencies…I don’t like my apps to be depenent on a lot of libraries for many reasons if at all possible. I’m ok with using stuff like Enterprise Library because it’s supported by MS but I’m taking more open source libraries.