How to vacuum package cooked food?

It is best to buy a vacuum packaging machine, as follows:

Step 1: The first thing you need is to put the ingredients into a fresh-keeping bag, put the container into cold water and put the fresh-keeping bag vertically into the water.

Step 2: seal the seal left on the water in the next step.

Step 3: Finally, of course, take out the water. The pressure of water is greater than that of air, and the air in the bag is naturally discharged. A vacuum bag is ready!