In a large bowl, toss the black-eyed peas, rice, spinach, and onion until completely combined. In a small bowl, stir together the vinegar, water, and pepper. Pour over the salad and toss. Chill for at least a few hours to let flavors blend. Sprinkle on the Baco Bits (if you use them), toss again, and serve. Note: I've never made this with the Baco Bits and think it is just fine without them. Note 2: One of these days I'm going to have to try to redeem my reputation as a cook and submit a -ed recipe more complicated than "Dump all this stuff together and put it in the refrigerator"!!