First question is not "how" but why?

Are you averse to bluffing for some reason? Find it dishonest (if so, don't ever play poker)? Worried you can't pull it off (it gets easier with practice)? Can't stand the thought of losing money (if so, don't ever play poker)?

Or.. my favorite possibility:
Just an academic/theoretical question.

which leads us to "how"

If you never bluff at all, you will get long term pwned by people who are aware of this fact.

But it's still possible. You just have to hide the fact. Convince the table -- however you want -- that you sometimes bluff. Laugh, junk the cards, and say "beer hand" if you raise your kings PF and everyone folds.

On the whole, it's easier to convince the table that you sometimes bluff by just bluffing sometimes. Cf. "gets easier with practice", above.