8 packs of gelatine
Step 1: Pour the soda into a pot and heat on high setting until it boils.
Step 2: Add 8 packets of gelatine and mix until combined.
Step 3: Turn the stove off, and let it cool for about 5-10 minutes.
Step 4: Remove the label from the coke bottle, put a funnel on the opening, and pour the gelatine mixture all the way to the top.
Step 5: Refrigerate for about 4 hours.
Step 6: Use an X-acto knife to cut around the bottle to remove the jello. This may take a few minutes, so be careful to not break the form.
Step 7: Once it is completely out, put the label and cap back on, and go surprise your family!