You absolutely can use bottled seasoning, and it can make some very good bacon. One of the three flavors of bacon I keep on hand at all times is seasoned with a seasoning mix that Jeff (the founder of the forum) has available and it's a fan favorite. It is a blend that lends itself very well with pork so works great for bacon.
This link is one that many, many people here use to calculate the cure for bacon as well as a lot of other cured delicacies. I've used it from Day 1 and it's never failed me:
Small business web hosting offering additional business services such as: domain name registrations, email accounts, web services, FrontPage help, online community resources and various small business solutions.
diggingdogfarm.com
Just enter the weight in grams of each piece of meat you want to cure and hit "calculate cure' and it'll tell you exactly how much Cure #1, salt, and sugar to use. A word to the wise though, if the seasoning mix you want to use has salt in it, which most do, you'll want to back off the amount in the cure by a little bit otherwise your meat will be overly salty.
Robert