Second time I've tried this now with no luck.

- 1 well rinsed 2L Pepsi bottle
- 1 cup sugar
- 2 cups of warm-hot water to dissolve the sugar
- 4 cups of cold water : result is 6 cups luke warm sugar water
- 1 tsp baker's yeast (stored in the fridge)
- half a dozen shakes

I have a check valve in the line to prevent the tank water from siphoning
back into the bottle.

I get foam at the mix's surface but no sustained CO2 after 24 hrs. It seems
as if the culture just dies off after it gets started

Tap water parameters a

pH ~ 8.0
gH ~ 3
kH ~ 2-3

In the second attempt, I used chlorine-chloramines remover in the water to
no avail.
The temperature in the house goes down to 16-17 oC during the day this time
of year. Could this be the problem? Do I need to insulate?