Also, I was reading your post on terraforums about the soil mix for your mini bog. You can grow both flytraps and cephalotus in a soil mix of 65% sand and the 35% peat. It all really depends on where you will be growing them. I have a similar climate to yours except that it is a little drier here and maybe a little colder in the winter. I will tell you a bit about my soil mixes and growing conditions.
Of course all my flytraps are grown outside year round in full sun. I have most of them in a 50:50 peat
erlite mixture. They do good, but I will be changing the mixture next year. Some I have in 50:50 peat:silica sand. In this mixture they do better than the peat, perlite mix. And than there are the ones in a mix of 70% silica sand and 30% peat. These did the best out of all of them this year. The lose medium seems to help them grow better. The only down fall to this is that they require more watering. But from the differences that I saw, I think its worth it. Maybe 60% sand and 40% peat might be a good mix. Better water holding capacity, but still great drainage. Or maybe even 30% sand, 30% perlite, and 40% peat will do really well.
Cephalotus will require a little more reading, lol. I have some in partial sun, under my porch facing southwest. In the summer they receive 3-4 hours of direct sun and bright light the rest of the day. Right now they are getting around 5 hours of direct sun. Since the sun is lower to us this time of year, they get more direct sun. Temperatures are always different. Even in partial sun, they will go through several days with temperatures above 90 in the summer, with nights above 60. In the winter, days might be in the 50's to mid 70's and drop at night into the 30's. As of now I only have 2 soil mixes for the partial sun grown ones. One is pure long fiber sphagnum. The other is 70% silica sand and 30% peat. Both mixes seem to be doing really well. They are both the same clone and seem to be growing at the same speed in either mix. Although, the one in the lfs has divided more than the other one. They were both originally one plant. The sand, peat one is still only 1 plant, but its an experimental plant, so it will stay there for several years before I will do anything to it. The lfs one has 2 nice big divisions and 2 small divisions. This will be one of the plants that I will divide, from which you will receive your bigger division. Watering, the lfs one actually gets watered more than the other one. It ranges from 2-3 times a week while the peat, sand one rarely gets watered more than once a week. The lfs plant is in a 2 gallon white plastic pot while the sandy one is in a one gallon black plastic pot. I know, its all over the place, didnt really think how all of it was going to come out when I started.
Now for the outside ones. One is the seed grown plant I told you about, almost lost it untill I decided to put it in full sun. The other is tissue cultured, but a different clone than the others. The seed grown is in a soil mix of equal parts peat, pumice, perlite, and silica sand. In a 2 gallon white plastic pot. Potted it up in late spring after almost losing it in a different mix. When I repotted it, it was about half an inch in diameter. It has since grown to a 2 inch in diameter little gem. It is still a single plant, but if you had seen the shape it was in before you would not think its the same plant. Its also coloring up really nicely, a lot of red starting to show. Because of the mix being so lose, I water it every day, or almost every day, in the summer, well, every night, helps cool down the roots a bit. Right now, im watering around once a week. The tissue culture one I received in mid summer, so i kept it in its 3 inch pot that it came in. Still I grow it outside and its doing beautifully, bright red. 2 parts perlite, 1 part peat. Watering it through the tray method for now. Fill the tray with about an inch of water and leave it alone for a week or more. All are acclimated to really low humidity.
For your bowl, I would recommend a mix of peat, perlite, and silica sand in equal parts. If youd like, maybe even a little more peat. Like throw in a couple hand full after you do the mix. I believe the sundews will also be happy there. Since im assuming you will be keeping them in full sun, keeping the soil watered properly wont harm the cephs. Just dont keep it waterlogged. Im sure you'll figure out a good mix on your own. Good luck.