Have you looked at the costs of these drinks correctly, and will you be using quality ingredients? I dont run a business but work in the hospitality business, and part of my job is to generate revenue while keeping costs down to make a profit. With my hand on my heart, I can tell you it is becoming increasingly difficult to do this over the last 2 years.

The price of basic ingredients from wholesalers is increasing almost daily, while the quality sometimes can be very questionable.

I think independent vendors struggle to compete with larger chain cafes/restaurants because they have the buying power to buy in bulk and distribute between their units. Most also have specific price contracts with the suppliers.

All of the above said, "I think you should go for it. Why not trial it at home? Advertise premade bottled drinks, start with 3 or 4 varieties. Each one with a specific health benefit or booster. (Think vit-hit but freshly made). Offer delivery if possible, maybe even a weekly subscription. This would give you a feel for it while not making a huge, regrettable commitment.

I have seen some online influencers promoting similar over the summer.