Put to a Square
Create a small square on the putting green with four tees. Hit three putts from 10 feet away and try to stop all three balls in the square. Continue at that distance until you get all three in the square. Progressively move 5 feet back as you get better.
Place three tees about 10 feet apart from each other. Grab three balls and start the drill by hitting to the first tee, second tee and third tee. Try to get the balls as close to the tees as possible. Now switch the order. Hit to the third tee, first tee and second tee. Keep switching the order to make the drill challenging.
Going the Distance
Hit five putts, and try to get each one to go a little farther than the last. Notice how big the gap is between all five balls. As you continue this drill, try and come as close as possible to the last ball you hit. This will fine tune your distance control.
Feel Your Stroke
Hit some putts to a hole 30 feet away. Before you stroke the putt, close your eyes and rely on your feel. Do this a few times and then hit putts with your eyes open. You should notice that you have a greater feel for how hard to hit it.