I improved the "setup" that I used last year, seen here.
My plants are now growing in a large square net pot, that fits perfectly into one of the sides of the thermos cooler/water reservoir.
Picked up the net-pot for $3.99
Some of this year's pitchers...
And finally, a flower! Pointing towards the sun.
The cooler + aquarium pump seems to work well - the temperature of the media is at least around 18*C, but after a fresh change of the ice-packs it goes down to 14*C. So far, so good...
Now to see how they survive in midsummer heat waves... Probably will have to bring them inside a couple weeks.