Wow, you were brave to start with 2 drops lol! I started with just one.
I've never heard of anyone filling the eyecup with HOT water, yikes, I sure wouldn't do that. I fill mine with room temperature distilled water and add the Eyebright to it. Some people run the eyecup under hot water to warm the glass which in turn warms the room temperature distilled water.
I fill the eyecup to the bottom edge of the eyecup rim, that works best for me. The goal is to move your eye in a circle 5 times to the right and 5 times to the left for each wash per eye. I do this several times for one eyewash, the more times you wash a day the faster it'll work. Don't forget that each time you do an eyewash to take at least 2 droppersful of the tincture by mouth. In the links below you'll find about everything there is to know about the Eyebright tincture.