Hot Chocolate question

Hey I'm a terrible person with food, but I've recently started drinking a lot of hot chocolate. I tried the stuff you pour directly into cold milk and it's done but that's not HOT chocolate, that's just chemicals :/

So I got myself some 99% cocoa powder and started drinking hot chocolate by bringing water to a boil, putting 1-2 teaspoons of the powder in and 2-3 teaspoons of sugar into a regular cup, about 1 and 1/2 of a glass ~250-300 ml, I pour in water about 7/8 of the way and finish it with some cold milk.

And this sometimes works perfectly if I get the powder/sugar and water/milk combinations just right, but that's only 1/10 of the time, and the rest it's really unsatisfying and either too sweet or not chocolaty or watered down :/

What is the perfect combination of 99% cocoa powder to sugar to water to milk? I've googled this and only found some weird "simple" recipe's that involved almost boiling the milk itself and putting in actual chocolate to melt or something crazy like that, that wasn't that helpful as it probably takes longer than 20 seconds to make, so out of my skill range, and that isn't very wide, I usually just take some bread and some meat and eat them taking bites separately, instead of trying to cut the bread and do anything with it... x_x Okay this turned out way too damn long:

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Tl;dr "What is the perfect combination of 99% cocoa powder to sugar to water to milk?"

bon appetit