More than half of my hiking trips I use AquaMira drops.
About 3/4oz for about a week, this is about the lightest I have found for water treatment. Note that this does NOT include morning coffee, nor, evening cocoa.
This does include two mini-droper bottles and a weeks worth of A and B.
Smell/taste is minimal. I do not tast it, but, my daughter does. It matters not, tannins in the water usually impart a rather bitter taste anyway. So, I just put in some flavouring. In hot weather, a dash of salt and potasium salt works OK to replace electrolytes. The bottles are rinsed first, since any leftover drink mix can kill the effectiveness.
Filters are better for larger stuff: tapeworms, etc. They do nothing against some bacteria and viruses.
Chemicals do well against smaller stuff: bacteria & viruses.
The combination of a filter and AM drops is VERY effictive. Clorine bleach and iodine can have harmfull side effects and is not recommended but usable. Few people react to clorine dioxide(same as AM drops), it is used in many(most?) treatment plants.