For making drop stitch, instead of doing it in the traditional way:
Row 1: Knit.
Row 2: Knit each stitch, wrapping the yarn around the needle twice instead of once when completing the stitch
Row 3: Knit each stitch, dropping the extra wrap off the needle as you complete each stitch.
Repeat these three rows for pattern.
I use a needle some sizes bigger for the second round: If I'm knitting with size 10 needles, I use a 15 for that round and get the same result. So simple and easy.