There is no viable way to convert condensed milk to "regular" milk. Condensed milk has added sugar dissolved into solution.

No, they add sugar to sweetened condensed milk, but condensed has been cooked down without added sugar.

You can use condensed milk in a fudge recipe. You will have to reduce the sugar in the recipe to account for the sugar in the condensed milk. Some fudge recipes call for condensed milk.

You cannot replace normal milk for condensed milk. You can replace milk for evaporated milk. Condensed milk is very very thick and super sweet , comes in a small can.

Regular Milk

Evaporated Milk

condensed milk 3 different products

You can find recipes for cooking with condensed milk on the following websites...allrecipes.com.au/recipes/tag-2433/condensed-milk-recipes.aspx or www.tarladalal.com/glossary-condensed-milk-672i