two small things bug me about this. 1. Why is he buying a single can of red bull and a single bottle of water from 7-11 every day? Why not buy in bulk and keep at your house? 2. Is there really much advantages to drinking red bull before a workout? I know there are advantages to caffeine, but I am not convinced red bull is the healthiest way to deliver that caffeine.
Agreed, I am all for making exercise a habit (and get grumpy when something makes me miss a workout, so I need to be better at simply making it a near top priority). That said, please don't buy bottled water every day. Get a reusable bottle, it's cheaper and much better for our oceans.
He is hong kong, unless he is paying a lots for a nice apartment he is probably living in a tiny shoe box of an apartment, if he bought all those bottles where would he keep them? the fridge would be tiny also. In hong kong there is literally a 7-11 or circle k on every city block. If you are on a major road you are no more than 100 meters away from the nearest 7-11
In fact, the 7-11 and Circle K here are so cheap that often times even buying in bulk, you can't beat their prices. And then there's the convenience factor: literally 30 seconds to grab what you want from the fridge and pay for it with the Octopus RFID tag.
If you look at what a can of redbull contains, it's not unhealthy if you buy the 10 cal/sugar free version. It contains B vitamins, taurine (an amino acid) and about 70mg of caffeine for the under 10oz can. They also use citric acid instead of the cost cutting phosphoric acid which causes calcium leeching.
The aspartame and sucralose may or may not be a problem for you.
A regular tea/coffee does just as well. I never had either before doing weights in the morning and frankly never felt the need either. Takes 10 mins more to snap out of drowsiness but isn't an impediment.