I have a more superior method than tap - buy the new breed of black-green skin water melons and especially "Yumi" brand of organic water melons.
They are super sweet like eating clumps of sugar but they are not cheap. A 10-13 pound melon goes for $9 at Sprouts.
So far I have 100% success rate for the 4 that I have purchased on different occasions. I have also tried other brands of black water melon but they weren't as sweet as the Yumi. Like in hifi, the right brand matters 🤣