Does this also apply to the non-alcoholic sparkling apple/grape/pear/...-juices mixed with vodka?

Vodka-Kidibul in Belgium is quite nice.

I don't know the brands in other parts of the world, but I see references to Welch in US...

When I look at the diving pictures, I don't think I ever dived from that height, for locations that were'nt regularly used for diving, this entails risk on its own.

Sometimes you see a bridge over a steep mini canyon and people diving.

If shortly before you dive, you see people diving (even if you never dived there before) it is much safer to dive there than if you don't see people diving, even if you have personally dived there before:

conditions under the water can change, submerged objects may have been thrown in locally, or rolled over a river bed from a different location, and if conditions under the water didn't change, the water level can simply lower and present new danger that way.

regardless of energy drinks, alcohol can obviously cloud your safety judgment.