First equip a bottle, then go find something to put in a bottle (example: fish, bug, blue fire, fairy, or anything else you can put inside a bottle). Now, hit the C Button to catch the item and hit start directly after hitting C button. Select an item you do not want (Claim Check is recommended) and equip it instead of the bottle you were catching the item with. Press start again and you will see Link still catching the item. Now you have an extra bottle. Do this on all of your weapons and you will have 24 bottles! (Note: do NOT save after doing this or else you CANNOT get your weapons back).