I do not use any kind of simmer ring on my alcohol stove. I simply put 3/4 oz of fuel in my stove and use it in combination with the caldera cone and the bottom of a pie tin cut out for a bottom deflector and let it burn full force. When the fuel is gone I wait about 5 minutes before removing the lid and wa-la, a perfect biscuit!
Panty-Hoes would have been a sufficient prefilter, and lighter. But I liked the ease of filling a water bottle with the funnel. It fit both a water bottle and a wide mouth nalgene perfectly. However I just bought a sawyer squeeze, and this is will be the only filtering device I will carry. The reason I am doing away with the chemical treatment is because I prefer to drink at the source immediately upon collection. The 5 minute mix time and 15 minute wait time is a little annoying.