Tin Foil Hat etc.etc

So all wireless devices incl tablets never see the Internet, and better, the Internet does not see them.
In my Raspi server i have a set of ip rules so it sees only the parts of the Internet I choose
In Reacticz there are calls to the outside world from my tablet
I've lost the top row of icons / fonts. (google fonts?) when I am on an network without Internet access.
I know that weather underground etc is not usable without Internet, so i do not call it from my tablet.
I can still use the results from Domoticz queries.
But calls to lets say google analytics for my home automation tablets are not necessary in my view.
Is there a way around this?