problemme with cool water

have my omega for 1 month and now I’ve been afraid for 2 days when I start the car he smokes at the exhaust only at the start then no more and today I wanted to look Mall for cool water and I almost fell dead in it was so white mud not much but enough I got really scared because I already gave 2 cars because of cylinder head away must in the last since the temperature is also around 90 and 95 high down no leak of water only at the start when it comes cold white it smoke out the back can be what I don’t want to think