I will sit in a chatroom that I'm in and instead of talk, just watch the flowing conversation. Sooner or later a word or a line of words reminds me of something on the preverbial back burner of my mind. I am not saying to copy what someone says, but maybe someone's conversation or just one or two words can trigger a whole poem or short story. So I write anyway, even when it seems like it's shit, just because it's getting rid of some more of the 'bad writing',getting the bad writing out of my system to make room for the good writing. If you like wine anyways.
Some writers use other inspirational substances.
Depends on what kind of writer you want to be known for. Go for a walk breath in the air. Find how you are feeling. Find your thoughts. If you are into writing stories, you could take an interesting life experience and twist it around, embellish it, and it would probably be great.