Mix water and sugar together in a saucepan and bring to a slow boil.
Add the bag of cranberries. Be warned, after about a minute, it might sound like you are making popcorn. The cranberry skin starts to crack and it makes a popping sound.
Gently boil for about 10 minutes. It will start having a jam-like consistency.
Pour into a serving dish or bowl and cool in the refrigerator.
Notes
The cranberry sauce will set when it cools. It will have more of the jelly-like consistency you are used to.Storage This stores well in the refrigerator for up to two weeks. When cooled place in a covered container. I also freeze this in mason jars (or other sealed containers). It keeps well for up to 3 months. Sometimes it's a little more runny when thawed. If you want to thicken it up, simmer it for a few minutes.
Nutrition (I am not a nutritionist. These are estimates only)