Could i open my vitamins and just swallow the powder inside the capsules with water for faster effect?

YES: Some people have difficulty swallowing pills. So, opening capsules and taking with food or liquid is an option. The exception is when the product is designed for slow absorption and/or is enteric-coated for this purpose. Most of these types of products are in tablet or pearl or granular form (combined in a capsule). Regardless, it be ok since capsules are only vehicles used for swallowing product.