Here's the basic Darlington californica care instructions.

Cobra Lillys have roots much like that of Sarracenia, thick, long & full roots. These also need 16" - 18" of soil and should be spaced at least 8" apart.

Above all else Darlington californica has to have cool roots. Keeping Cobra Lillys alive is tricky without living someplace where it is naturally cool all the time. Some people set up extravagant water systems to keep cool water circulating around the roots. You can put an ice cube on top of the soil to help keep the roots cool. Or pour chilled water over the soil a few times a day. Basically, if you can't keep the roots cool, around 50º F being better I wouldn't try to raise this one. The roots can get warmer during they day but they must cool off significantly at night time for any chance of success.

But, everyone on the forum says just pour cold water on them a couple times a day. Also recommended to cover the soil with something reflective to bounce the heat off of the soil. Check out the forum for more info or to ask questions. Bouncing the sun off the media helps greatly, most anything reflective works. Including aluminum foil.

Dormancy -Darlington californica MUST go dormant for the winter, if not they WILL die. They require 3 - 4 months of winter dormancy, triggered by temperatures below 40º, though they can tolerate temperatures much lower. Once dormant they require very little light and must be kept much drier (never let them dry out). A garage or shed makes an excellent location for dormant plants. Darlington californica can tolerate temperatures down to 20º or lower. In the wild in some areas they are covered with ice during the winter.

Water - The most important thing about water is the type to use. I personally use reverse osmosis water. Distilled from the store and rain water are also acceptable. If you get distilled water from the store make sure it says "Sodium Free" right on the front of the jug. If you have very many plants a reverse-osmosis under the sink model from Lowe's/Menards/Home Depot/etc. will pay for itself pretty quick.

The other thing about water is how much to use. Use a plastic pot with drainage holes and place it in a plastic water tray. Keep at least 1" of water in the tray at all times, more if in bright light. The more light the more water can be tolerated. If you choose to water Cobra Lillys overhead then doing so with a mist is better than pouring it on them. You can get a pump up mister for $8 - $16 at most garden centers.

Soil - Carnivorous plants evolved to eat bugs to make up for the nutrient poor acidic soil it naturally lives in. Regular dirt or potting soil kills them fast, and never use fertilizer. Use 50% Sphagnum peat moss and 50% perlite. You can mix in 25% long fibered sphagnum moss and/or use it for a top dressing if you like. I like doing both with Darlington californica. Make sure you get pure Sphagnum peat moss, you don't want Miracle Grow or any other chemicals mixed in with it.

Light - These need a fair amount of light, at least 4 hours of indirect sun. Growing outside is highly recommended. Florescent lighting can also be used. If florescent is the primary source of light use two 40 watt cool white 4' bulbs within 14" over the plant. An economical shop light works well for this. Put the light on a timer to go on and off with the sun.