It is not safe to ingest essential oils, either straight into the mouth or diluting in water or food & beverages. Essential oils used in the food & beverage industry have been put through a deterpenation process (removing harmful chemicals) which then makes them safe to consume.
I do not encourage these methods in my practice in any form. Various inhalation methods & applying topically (correctly diluted) is more effective and safe (when used as directed). Never use neat (undiluted) for any age range but especially on babies, toddlers & children. For peace of mind and safety, essential oils should be used under the strict guidelines of a qualified Aromatherapist / Aromascience Practitioner, especially in regards to babies & children, during pregnancy and breastfeeding or if you suffer chronic illness and take regular medication.
Use only as directed, Many essential oils can be toxic if ingested, even in moderate doses. Never ingest or use undiluted essential oils (neat) on the skin, for any 'therapeutic' purposes. If oil is ingested by accident, drink fatty milk and seek advice, do not drink water nor induce vomiting. Consult your healthcare professional if symptoms persist.
Shelf life for Body Blends is approx. 12months if stored away from heat and direct sunlight. Shelf life for synergies is 2-6 years if stored in the same manner.