>If you don't want to give them your data, you mustn't use Google.

That is not sufficient. Recipients of your emails must also not use any Google services (also recipients of their emails etc).

Not using Google is probably the best solution. If you still have to use it for whatever reason, don't give them all your data. The only thing you really have to give them is your search term.

Lack of data is also data. How many people do you think send absolutely empty requests? It probably makes you extremely unique.