Your title and question seem totally different from one another.
I have never read of anyone making a spray wax.. You clearly can make a QD out of a rinseless or waterless wash.
Spray wax would typically be bought. From what I have used so far I really like Eco Touch quick wax and Sonax BSD (technically a QD but behaves more like a spray wax). Other favorites I have read about would be Optimum and Souveran.