They only have some money to meet their basic necessities (en plural). Yes most are basic ( =essential) commodities - food, clothing, etc But some are services - shelter/housing, transport, medical care etc.

Mario the idiom would be 'they only have enough money to make ends meet.' You don't use 'the' here.

Basic needs. You can also use this idiom: "make ends meet" in this context. They only have money to make the ends meet.

Also to answer your question, no these are not commodities. Commodities are things that you can buy and sell, e.g wheat, rice, crude oil, gold, petroleum etc. Things like this are bought and sold in the commodities market.

You would say 'basic needs' I know the word is necesidades in Spanish but in English we usually wouldn't use it for this. Also you would say 'enough' rather than some because you have used the word 'only'. They only have enough money to meet their basic needs.