I’ve never used the Body Ecology kefir kit, so I don’t know exactly what that entails, but I make coconut milk kefir with regular kefir grains, and I’ve found that temperature and brand of coconut milk make a difference. Some brands thicken up a lot, and some very little. You can always scoop a little out to see if it tastes slightly sour (which is the goal). Different brands also have different “finished” flavors, I find. If it’s cold, it might take two days.
I don’t think you can use liquid coconut milk kefir as a starter.
You should be aware that kefir grains eventually die if they’re only in coconut milk. I make goat milk kefir for a housemate of mine to keep my grains from dying. I just rinse and swap the grains every week and they seem happy enough.