Pour 1 cup of flour into your water bottle using a funnel. if you don't have a funnel at home you can make one from paper. now blow up your balloon just enough to add some air inside. put the balloon opening over the neck of the water bottle and begin transferring the flour from the bottle to your balloon. will this mold

No, this will not mold. Mold typically occurs when there is moisture present and flour alone does not contain enough moisture to promote mold growth. However, it is important to keep the balloon and flour mixture in a dry environment to prevent any potential moisture from causing mold.