I took a 1 gallon bottle of gatorade and drilled out the center of the cap. I placed a 2" piece of 1/4" OD tube in the hole and siliconed it to the cap. I then placed the bottel upside down, in my sump and held it in place with a wooden board so that the top of the 2" tube was right at the water line. As the water evaporated and water level dropped, the kalk would drip in and replace any used water.
Be careful where you pull your kalk from, sludge will collect in the bottom of your container and it is possible that the slurry will settle on your corals and damage them. Learn from my MISTAKES. I don't drip kalk any more, I use the Randy Holmes-Farley three part.
You can order Mrs. Wages on line but I would check with your local supermarket and see if they can special order it for you. Since you are in Washinton state, it is a seasonal item. It would really help if you could give them the UPC code to see if it is something they can order.