Join the 10 Day Drink Ketones Challenge. This is to Challenge you to drink Ketones for 10 days and experience what it feels like to operate on a premium fuel source. Now available in the United Kingdom, Italy, and Euopean Countries. Join the 10 Day Drink Ketones Challenge. This is to Challenge you to drink Ketones for 10 days and experience what it feels like to operate on a premium fuel source. Now available in the United Kingdom, Italy, and Euopean Countries. Join the 10 Day Drink Ketones Challenge. This is to Challenge you to drink Ketones for 10 days and experience what it feels like to operate on a premium fuel source. Now available in the United Kingdom, Italy, and Euopean Countries.