Is straw/sippy cup necessary?

Is straw/sippy cup necessary for infants who have started solid? If yes, please do recommend a non-expensive one as my LO loves to throw things on the floor 😫 My LO is 7 mths old, been either spoon feeding him water, let him sip from a cup but he didn't take it too well yet or use his milk bottle that has an auto straw in it.