Just walk are far as you can to look for water, food and for anything that will help you survive. Then your thoughts, words and these actions become prayers.
He will surely send help. There are only two good possibilities.
One he will send help to you or lead you to a place where you can survive.
Second possibility is that, he will personally rescue you from the desert and bring you to his home where you can have everything you need.
Have faith, because you can't lose if God is with you.