This is for those of you who like flat soda(in a bottle) but don't want to pour and leave it out, or shake it knowing the consequences of doing so, just to make it flat. Sorry for the pictures for being so small.
Step 1: Pick it.
Get your bottle of soda and open it.
Step 2: Squeeze it.
Squeeze all the air out of the bottle.
Step 3: Cap it.
Screw the cap back onto the bottle and read the next step.
Step 4: Shake it.
Shake the bottle until the bottle fully expands, BUT stop shaking it at that point.
Step 5: Enjoy it.
Open it and and repeat steps 2-5 until the bottle stops expanding. This may not always work but if it does enjoy. If someone wants to explain this, as i cannot, feel free to. Also, this is my first instructable.