Drink or drinking or to drink?

1. drink coffee.

shininggirl Which one is right?The first thing I do in the morning is...1. drink coffee2. drinking coffee3. to drink coffee

1 or 3.

CJ

I don't really like the insertion of to, because "to drink" doesn't parallel the form of the first verb in the sentence. Maybe that's just me, though.

I would only say #1. #3 sounds very unnatural to me, wrong even.

ozzourtiI don't really like the insertion of to

Then you can omit it! I do.

Nevertheless, the rule about echoing "do" with another verb is to use the infinitive with or without "to".
If echoing "doing", however, the -ing form is used.
(Huddleston)

The last thing you should do just after having lung surg