In short buying that bottled nonsese is a waste of money in the truest sense of the word. When you take a mere peek at the facts.
We as hobbyists are concerned with 2 bacterias. The first is
Nitrosomonas it converts ammonia into nitrite. The second is
Nitrospira which converts nitrite into nitrate. These bacterias have two characteristics we as hobbyists and for the sake of this conversation need to pay close attention to.
A. They need oxygen in the water to live
B. They need a 'food' source to survive.
And C. None of these are available in a bottle. In the bottle they would have no source of food or oxygen. Packaged up in a bottle they would die!
D. It is a huge con! A successful con because nobody wants to go through the cycling process. I remember mine vividly, checking my stats daily. Huge water changes, cleaning up the inevitable spillage, and all this for 2 months plus? Yes it's what makes this con a success many (myself included at one point) are willing to consider. But take a peek at the scientific fact and you will see that it's faker than 3 dollar bill, the Jedi force (although im a huge star wars fan and am hoping for the 9 disc bluray for xmas) fairies and nhomes etc etc.
Take a look at the bottle and read the descriptions. Some will state that they've created a special blend of herbs and spices or elude to the fact that they have in fact created a new breed of bacteria. This is false wholly and utterly when you take into account the legal ramifications and multi millions upon millions involved in bringing a bio engineered "species" to market and then sending that species around the globe

Others state that their product will "aid" your Nitrosomonas & Nitrospira. Scratch the surface scientifically and again you find that these claims are utterly false. There is no backup or substitute bacteria in the nitrogen cycle.
I took a while in responding to this properly because I was trying to find a blog I came cross a few years back. It was a hobbyist from the US who on entry to this blog got a lab to take a microscopic look into what is actually in these bottles. In some he found nothing whatsoever bar common bacteria that surround us. In others, chemicals which when combined create dechlor + regular bacterias. The second experiment was to swab some of the media from his external onto a petri dish as before. And though and behold under a microscope an abundance of Nitrosomonas & Nitrospira.
Bottled bacteria is a con! You've got to take into account that to us is a hobby but to others it's a business, a marketplace they intend to profit from. And I'm willing to bet that the return on a plastic bottle which claims to hold in abundance something you can't actually see with the naked eye (aka bacteria) the margins on that must be real profitable.