How do you steam foods to make baby food?

OK... lol... so I'm not exactly a great cook. I try not to whenever possible. I am going to make my own baby food and know you have to steam a lot of things. How do you steam foods? I want a way to do it at home without having to buy one of those expensive baby food steamers. All advice is appreciated. :-)
Update: Also, how long does baby food last if I freeze them? I have a freezer in my refrigerator (duh) and also a deep freezer.
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