What is it? Remember coconut water? Well, get out of here with your coconut water, grandad! All the cool kids are drinking watermelon juice now.

How much does it cost? I tried Mello watermelon juice, which costs £2.50 for 250ml. So, to answer your question, it costs about eight and a half times more than petrol.

What does it promise? Allegedly a great post-workout drink. It is alkaline- and fat-free. It rehydrates, speeds metabolism and aids muscle recovery. This, I am told, makes it a pretty nifty hangover cure.

What’s it actually like? It’s important that you buy watermelon juice and not cantaloupe juice, because I tried some of that as well and it tastes weird and spicy, like liquidised Korean food. Watermelon juice, on the other hand, is a delight. It’s delicious and refreshing and, thankfully, it tastes exactly like watermelon. This immediately makes it better than coconut water, which I’m convinced nobody actually likes. However, you have better things to spend your money on than this. For instance, you could buy an actual watermelon for roughly the same price, and it would probably yield far more juice. I think my point is that you should take a watermelon to the gym and eat it in the changing room.

Best and worst bit Watermelon juice tastes fantastic, and drinking it makes you feel like you’re doing good things to yourself. However, a small bottle does contain 17g of sugar. Combined with the fact that I’m not an insane billionaire who farts money, that’s enough to put me off.

Is it worth it? Sure thing, Rich Uncle Pennybags.