The essential oils can be used in various methods, so the best way to approach self-defense is to make up a blend of essential oils in a bottle, and then take the drops you need for each method of use when required. Kept undiluted in this way, they will remain active for a much longer time than if diluted. You can multiply the number of drops, but keep the proportions the same:
Blends 2 and 3 could be added to unscented shower or bath products made using natural ingredients. For baths, add 4 drops of the blend to 1 teaspoon of carrier oil and 1 teaspoon of salt before adding to the water and dispersing well with your hand.