The original plans I used (from a BMW site) are kaput, so look at this one, with some caveats:
Here's the sprayer I used. 2-quart should be fine for a Speedster/Spyder system:
Caveats: You do not need a pressure gauge. What are you, NASA? Give it 3 or 5 pumps (tops) and you're good to go.
Get a real VW brake fluid reservoir cap (or a cap for whatever reservoir you are using) and modify THAT. Nothing beats the real thing. Remember to add an o-ring or rubber washer inside of the cap to seal it if it doesn't come with one. From the top (inside) of the cap, figure out the depth that the fluid is when at the "full" line. Add a length of copper tubing from the cap to that depth and when you're done bleeding and drain the system, THAT will be the depth remaining in the tank (see the user manual).
You do not need a tank bleed valve, but if it comes with one, that's a bonus. Instead, just unscrew the pump handle enough to let it release pressure. Again, we're not talking a lot of pressure here - maybe 4 - 5 pounds max - to do whatever bleeding you need to do and you will not have brake fluid just spewing out when purging the tank - not gonna happen.
The water-cooled division of Five Cent Racing stole my version with the quick disconnects so my remaining one just uses the the original sprayer wand valve (which has a locking on feature) and the hoses that connect to that. Unscrew the cap end, screw the cap onto the reservoir then screw the hose onto the wand valve and let 'er rip!
Here is another good video showing how to make one:
Remember to gently pump a little fluid through the system first to get it to the cap, then screw on the cap and pressurize the system. It will hold 2 quarts of fluid, enough to easily bleed the entire system whether Speedster or Spyder (hydraulic clutch, too).
I never save the remaining brake fluid - it absorbs water too quickly so I just discard it. You can try bleeding with just a quart of fluid - I have and for one or two wheels (maybe even 3 or 4 if you're efficient) had no trouble. You cannot introduce air into the brake system with this bleeder due to the design of the cap tube.
I had all the stuff beyond the sprayer kicking around the shop, but even if you buy new parts to do this, you should come in somewhere under @$25 bucks, or about $100 less than commercial versions.