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…showed last 75 words of 2593 total…oil per cup of carrier oil). For baths and diffusers, try adding about six drops of oil to the water. For air-freshening water sprays, try three drops. Remember, the concentration of essential oils may vary, depending on the brand you choose. Start slowly, gradually adding just enough oil to achieve the level of aroma you desire. Essential oils usually are sold in small bottles with droppers so that you can add oil drop by drop.