for you to
It is necessary for you to have support teams to bring water and drinks.
前面的介词应用for,而不是of
在这类题中,判断介词是用of还是用for,主要取决于介词前面的形容词,如果这个形容词是修饰介词后面的人,那么,用of；如果修饰后面的动词不定式（to do sth）,那么,就用for
eg. It's easy for you to do it.
It's nice of you to help me.