I developed my own method of starching fabrics for quilting. I buy Sta-Flo liquid laundry starch at Walmart (most grocery stores carry it too). In a small bowl, I mix up 1 part Sta-Flo to 1 part water. I lay my yardage on the kitchen island and use a large wall painting brush to brush the starch solution onto the fabric. I give it a couple of minutes to allow the fabric to absorb the diluted starch mixture, then toss in the dryer. The bowl and brush are easy to rinse off in the sink, and the kitchen island cleans up quickly with a sponge and water. Later I iron the fabric with steam; steam re-activates the starch. This is the fastest method I have found for starching yardage.
Edit: Because I have had carpal tunnel syndrome and also have some arthritis in my hands, I really don't like the idea of using a spray bottle repetitively. If I need to use spray starch, I use the canned variety from the store. It's pressurized, so I don't have to do a lot of squeezing.