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Some of the previous answers have discussed the idea of opportunity cost and the related saying, "there is no such thing as a free lunch." I will certainly discuss parts of that; however, I'd like to explore a more philosophical angle for a bit.
First, I don't honestly believe it is possible to get "anything/everything" for free. There is simply stuff that is unobtainable. Having all the material in the universe in the palm of your hand is not possible, regardless of how free or expensive you believe it is. If we are allowed to use Disney logic, then it is possible to be an all-powerful being for free. You just have to wish to be an all powerful genie like Jafar did. Of course it could be argued that there was a cost. He was enslaved to the lamp.
Moving forward, perhaps this question is asking how a person can get items at no monetary cost. One way to do that would be to steal it. I would have possession of an item, and it didn't cost me any money; therefore, I got it for free. Accepting a gift would be another way. If you are given a new game for your birthday, you have ownership of an item that you didn't pay any money for. I can imagine a world in which you have such good friends and are such a good thief that you get anything you want without actually paying for it with money.
Opportunity cost is where things get sticky. Opportunity cost is essentially the trade-off you are making for every choice or purchase. You may certainly steal something, but it did cost a bit of morality. Also, in order to actually get to the item that you stole, it cost you time at a minimum. In order to have very generous friends, I'm sure that you had to cultivate those relationships. That took time and energy. A restaurant might be giving away a free lunch, and you may have enjoyed it a lot; however, it cost you the opportunity to eat somewhere else. It cost you time to get to that restaurant. Taking into account the idea of opportunity cost, it isn't very likely to get any single item for free let alone anything/everything.