If your angelfish are aquarium strain, generations bred in your area, (as stated above) the actual pH is not as important as stable high quality water, and this is achieved by frequent partial water changes. Wild type Angels would be problematic in your water.
Is the tap water pH also 8.2? What about alkalinity and hardness? These numbers can be accessed by googling your city EPA drinking water quality report (they are sometimes noted on your water bill).
Using peat in filters or bog wood in a tank, might lower pH by a tenth, but if your water is highly alkaline and hard, it will most likely resist those methods of pH change.
Using peat may also color the tank water brown like tea from the tannins.
Because my tanks are outside they get seasonally inundated with tannic acidss from surrounding vegetation and leaf litter that falls in the tank, because there is so much tannic acid, my tank can drop an entire point from 8 down to 7, but in a few weeks always returns to 8, as it clears.
If you want to successfully breed angels, I would suggest getting an RO system, or blending water change water with rain water (if you live in the Pacific north west, this may be a viable option).
But if you just want a couple angels in a tank to watch, just giving them stable high quality water is the most important factor, as opposed to messing with pH by adding acids.
The problem is not so much the fish themselves, but certain bacteria (like those associated wit HLLE) do best in water between 7.5 and 8.5 pH, with a high mineral content. and become a chronic problem, show up as scarring as soft water cichlids age, because soft water cichlids have not evolved a resistance to these bacteria in S American mineral poor, softer low pH waters, such as hard water species like rift lake Africans, or Central Americans have..
