I looked in to it and opinions differ. So here goes. Water extraction or naptha/alcohol extraction? I know whater is easier and faster, but don't care about that since the alcohol way is easy enough and it will be next week before I do it anyways so I have all the time. I want least waste and least likely to make me sick.
do the alcohol/naptha one that way you will have it all good, and it extracts more of the excess guck on the morning glory seeds that the water extraction would leave in your stomach. just a thought.
it depends on how much you want to do, and how much work you want to put into your extraction. A water extraction extracts some nauseating chemicals, and if you're doing a large amount you'll feel sick. I've always thought feeling sick before/while tripping is a good way to set yourself up for a bad time. However, I've tripped before while being nauseated and had a great time. I think a lot of the discomfort might come from your personal mindset.
Neither extraction seems difficult to me, one is just easier. However, don't mind putting in the extra effort for quality product. It is about quality for me and have the patience.
i've never done the alcohol/naptha extraction so i can't tell you if it really is worth it, however the water extraction didn't make me sick, though i got a bit nauseas at the start of the trip. i'd try the alcohol/napth one this time, that way you will get a better extracted product and it will be easy to conceal and eat.