Take a sharp pencil and make a hole just large enough that it makes a snug fit for a straw to pass thru for both the entry and exit holes. Take a pair of small sharp snips and cut a small "V" notch in the straw. Might need two notches pending powder type. Take a piece of tape and wrap backwards to make a gripping for the straw so you can turn it. If you are going to be doing a lot of trickling, heat up a pin so it will pass thru the straw for a handle. Add powder and turn the straw. Normally for a short usage, the cup won't leak if the hole is made right. For longer duration, add a piece of saran wrap with tape over it so it acts like a gasket. It was more for the fun of it. If I had to do enough of it, I'd make something more permanent from garage stuff or buy one. But for the most part, I don't need to trickle so didn't see a reason to just have another piece of gear in the way.
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