Oi! We're not adolescents.

No you don't have that excuse

No, they have a far better excuse: they're journalists

"but am I right in assuming you can bung two, three or more sachets into the same glass of water to increase the strength?"

Yeah, so It'll kill you two or three times quicker. Evolution at work.

If you're stupid enough to try and drink that junk you deserve to die, just to keep the gene pool clean.