Help needed SQLiteDataAdapter

Started off that I have this:

      sql = "SELECT * FROM Foods;";
      try
      {
        Variables.conn.Open() ;
        var daFoods = new SQLiteDataAdapter(sql, Variables.conn);

Now need to put the data adapter in the Variables class for global access.

I can work this bit out:

        Variables.daFoods.SelectCommand = sql;

But I can't work out how to get Variables.conn into daFoods so I can call :

        daFoods.Fill(Variables.dsFoods) ;