Why not drink from the tap?

为什么不从水龙头喝呢？

youdao

Why not drink some lukewarm water?

为何不喝些温开水？

youdao

Why not drink a little (a bit of) orange?

为什么不喝点儿橘子汁呢？

youdao

And, in a sense, one could say maybe this is not Plato's last word, I mean why does Socrates choose to stay and drink the hemlock?

或者也可以说，这并非柏拉图的结论，我是说为何苏格拉底,选择停留并服下毒参？

耶鲁公开课 - 政治哲学导论课程节选

If they want to pick on smokers, why not pick on those who drink alcohol.

FORBES: More Employers Shun Tobacco Users

So why not give these super boozers a forceful economic nudge to drink less?

FORBES: Minimum Pricing, Maximum Confusion: Should Governments Fix The Price Of Booze?

Or why not campaign for the French, especially men, to smoke and drink less?

ECONOMIST: Health care in France