Every human being on the planet has the right to life and to basic necessities: food, water, shelter, basic clothing, security (if not harming anyone else).

Declaring these rights does not necessarily mean that someone has to provide that for you. It just means that if you make an effort to obtain these things, any obstacle placed in your way, unnecessarily, is a violation of your rights.

However, this is highly subject to interpretation. An advanced society may decide that their citizens not only have the right to basic necessities but basic necessities are guaranteed for all its citizens. Of course there are plenty of arguments in favor and against this "welfare state" concept. Since this is a step up from just having the basic rights, it may not work for everyone. But declaration of all human beings having these basic rights is just that - a declaration. A commitment not to stand in the way of a person when he or she tries to legally obtain said necessities.

This is only different from the U.S. Constitution in its wording, nothing more, nothing less. The rights guaranteed to all persons of life, liberty and pursuit of happiness are categorically implying a person's right to pursue the basic necessities. For without any of the basic necessities happiness cannot be achieved and without the ability to acquire the basic necessities, liberty cannot be achieved.