Can You Explain Necessity Begets Facility In Islamic Practices?

This concept is pretty simple. If a Muslim man is so thirsty that he might die with thirst then YES! He can drink the wine the Christian has to offer. But if the case is otherwise and he is not thirsty enough to die then he should look for something that is halal in the Islamic terms. Same is the case with eating. If he is so hungry that he is going to die from hunger then he can eat what is not allowed in his religion only for his survival but if his hunger is controlled then he should look for something that is Halal.