Q. Please tell me the measures that can be taken to ensure that we are consuming halal food

The Prophet said to leave what we are in doubt about and to keep what we are not in doubt about. We should do our best to eat and provide lawful food for our family. There are many more halal butchers available in the US, Canada, and Europe than there were ten years ago. As for restaurants, to begin with they are not reliable even for basic cleanliness. Anyone who ever worked in one will confirm this for you. Personally I do not eat in restaurants except one halal restaurant run by Muslims near my house. Otherwise, my wife and I are happy to cook and eat at home or at the house of friends and relatives.