I generally drink yerba a few times in the morning and sometimes at lunch and nearly always leave kava until the evening but I did have a heavy yerba morning one Saturday and then a good shell of Pouni Ono just before lunch with some very interesting results! It was like a coffee type caffeine rush but without the jittery negative aspects of coffee, sort of up (not high) but relaxed with it. I'm not sure I would do it all the time as I prefer a balance to heavy kava experience but every now and then it's nice.
Also with the instant you can mix it with whatever you want to and it would work fine. I would get a shaker bottle for ease of mixing rather than messing about with stirring with a spoon. I used to use plain water and chug it but you can use almost anything, whatever you fancy, juices, sodas, etc. Try it with milk too, I like the taste and it helps me use the kava better.
