Possible to make sourdough starter quickly? I was hoping to use a recipe that requires sour dough starter tomorrow for dinner.  When looking online for recipes I found several, but all of them required several days (examples here, here and here)
 to make.

Is it possible to prepare a sourdough starter in around 24 hours or is it too late in the game for me to get something going for tomorrow night's dinner?
You aren't going to be able to get a sourdough starter from flour to ready-to-bake in 24 hours. You could easily make a poolish or pâte fermentée in that time, and get some of the flavor. You might also be able to use some yogurt whey or another source of lactic acid to get some of the sour flavor. Unfortunately, a sour starter is something that you kind of need to keep going and have on hand.