Can't decide which is right between {it needs drinking, it needs to drink}
Does 'to need' want the -ing or the infinitive form as a verbal object ?
Thank you.

Question

Answer

Both are possible, but the meaning changes totally! It depends on what the subject of the sentence is.

I need to drink     =    I'm thirsty and I have to drink something

This milk needs drinking =   This milk needs to be drunk

You'd say the second one if a carton of milk has been in the fridge for a few days, and you are telling someone that the milk should be drunk before you open a fresh carton, for example.

I need to wash           =     I must take a shower

The car needs washing     =   Someone needs to wash the car.

I hope that's clear.