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Select 3 small 1-way valves used for bicycle tires and pick out a hot knife with a tip that matches the size of the valves. Also, get a 50-60mL needleless syringe and 12 inches (30 cm) or so of plastic tubing that matches the size of the valve.  Some valves are 6 millimeters while others are 8 millimeters. Either kind is fine, but your plastic tubing should match. Find these syringes at most drug stores. Pick the kind that doesn't have a needle coming out. Look for hot knives at craft stores or home improvement stores. Change the tip on the hot knife to the round tip that's the same size as your valves. Plug the knife in to heat up. Gently pull the plunger back on the syringe about 1 inch (2.5 cm). When the knife is hot, plunge it into the side of the syringe, making a hole in the space you've created by moving the plunger. The exact spot doesn't matter, but place it closer to the tip edge of the syringe than the plunger end. Try to keep the hole as small as possible, as you want the valve to fit in the syringe tightly. Unscrew the black cap off the top of the valve. Turn the threaded part of the valve into the hole. Keep turning it to the right (clockwise) until the valve is as far as it will go in the hole. You'll still have the top part of the valve sticking out of the syringe. At this point, it can help to squeeze a little superglue around the valve, as that will help seal the pump. The length doesn't need to be exact. After you cut it, wedge it onto the tip of the syringe so it fits over it tightly. It can help to add a dollop of superglue around the edges to keep it in place. Push it in as far as it will go. It will eventually hit the lip, and when it does, stop there. You may need to use pliers to help work the valve into the tubing. Some people skip the tubing altogether and just press the valve into the end of the syringe's tip. You can test both options to see which works best for you. Use any length of tubing but make sure it's long enough to reach your pressure chamber. Once it's threaded onto the tubing, attach it to a valve on your pressure chamber to complete the pump.  A simple way to make a pressure chamber for your vacuum pump is to drill a hole on the top of a canning jar and insert a bicycle valve thread-side down into the hole. Seal the edges with silicone gel or superglue. To use the vacuum, start with the plunger of the syringe nearly all the way in and then pull it out to the end of the syringe to create a vacuum.

Summary:
Pick out a syringe, 3 1-way valves, a hot knife, and tubing. Burn a hole in the side of the syringe. Screw the valve into the hole you've just made. Cut a 1 in (2.5 cm) piece of plastic tubing and slip it on the syringe. Press the non-threaded side of another valve into the tubing. Attach tubing to the threaded end of the valve.