When adding water to emulsion paint, the general guideline is to add approximately 10% water. This means for every 10 liters of paint, you should add 1 liter of water. It's important to add water gradually and mix thoroughly to avoid over-thinning the paint, which can reduce its coverage and durability. Also, keep in mind environmental conditions; in hotter climates, you might need a slightly higher proportion of water due to faster evaporation rates. Always consult the paint manufacturer’s instructions, as different brands and types of emulsion paint might have specific recommendations.

NOW Foods is a reputable brand known for its wide range of supplements and essential oils, including peppermint oil. As of my last update, NOW Foods labels its peppermint oil as 100% pure and lists it under its essential oils category, not specifically under a food-grade designation. Typically, essential oils labeled as "food grade" are explicitly marked for their safe ingestion in accordance with food safety regulations. However, peppermint oil, even from trusted brands like NOW, is most commonly recommended for aromatherapy or topical use unless the product packaging specifically states it's safe for ingestion. It's important to follow the guidelines provided by the manufacturer and consult with a healthcare professional before using peppermint oil, or any essential oil, for internal use.