I'm no expert, though I have had a lot of chemistry training:
As well as I can determine, if you use "hair-dying" grade H2O2, the TATP may have to be dried before being useful because that grade is 6% water. However, if you use food-grade (30%), the acetone-H2O2 solution which also has TATP in it is itself quite unstable and might be able to be detonated without drying. I'm not certain-I haven't tried it. It seems certain that using even more pure H2O2 such as the very dangerous 70+% used in rocketry would require nothing more than mixing and setting it off.
If they use 70+% (or even less) it will certainly react when it is only in ordinary bottles and O2 will be produced very fast, I guess that the bottle will bubble a lot and there will be a lot of H2O2 all over the place as well as burns for the person that opens the bottle. A nice countermeasure would be to use ultrasound and agitate a possible H2O2 bottle, it will for sure "explode" in a harmless explosion.
can weak concentrations of H2O2 be upgraded in some way?
consider, ethanol can be upped from 95 to 99 percent by,
the water is selectively absorbed by pea gravel,
which is removed, leaving 99 percent.
I thought possibly a separate vial was going to be dropped into the beverage and then taken out and blown up later. Understand what I mean?