2 bottles, 1 is 1.5L other is 1L
Drilled a small hole in the cap (smaller than the circumference of the typing)
at one end cut the tubing on an angle and insert it into the hole you made in the cap, since the hole is smaller than the tubing you will need some pliers to pull it through. Have around and inch past the cap.
For the mix, many people use different mixes but i did this:
1.5L bottle --- 1 1/4 cups of sugar, 1/2 teaspoon of yeast, 1 teaspoon of baking soda, add to the bottle and shake until no sugar is seen. (whole mixture should be up to the part where the top of the bottle is starting to curve in) Now you can either screw on the cap with the tubing and hook it up to your tank or you can leave it over night to activate.
For a way to diffuse it in the water i used a wooden airstone (as shown previously) and placed it under my filter.
Been getting 2 weeks of continuous co2. Once this runs out i will be trying the diy Jello co2 since i have read that it works for 2-3 months.