Yes but we do not have (it seems) free will to do the things that will influence tomorrow's wants.
What I have in mind are little things. I didn't like nor wanted broccoli, but trying it even when I didn't particularly care to eventually led to having a taste for it. Removing yourself from a sphere of influence you wanted to be around may eventually erode tour current wants of association. Undertaking the habit forming behavior of wearing a seatbelt may (counterintuitively) alter your internal wants over time.
I can't walk into a grociery store and actually (and truly) want veal; no way, no how, and no matter what I do, I won't want it today, but if I decide to buy some and eat it, and continue to do so over time, that self torture might have a way of manifesting itself in the form of an actual change of taste for it.
There's a particular kind of music I don't like, but if I intentionally set aside a few minutes a day to listen to but a single song, and if I increase it to 30 minutes every other day, a time may come where certain aspects would be appreciated that would not likely happen over the short run.
So, although we may not be able to have a direct impact on our current wants, there are things we can directly do that may serve to at least indirectly alter our wants of later.