he's a very strange person, he only drinks boiled water__:
he's(他是) a(一个or个 -- both correct) very(非常or特别) strange(奇怪的or 古怪的/怪的) person(人or家伙), he(他) only (只)drinks(喝) boiled water(开水)
——他是一个特别古怪的家伙,他只喝开水。
——when you translate it into Chinese, in oral Chinese, you may leave out some words in the translation. Such as "a" or "person". So, it can be like this without different meaning but be more oral style:他非常的古怪,只喝开水。 or 这家伙非常的怪,只喝开水。