This topic is an open wound with salt in it.
Some people say don't use Chlorine with Stainless, others say it's ok.
Kegs are made from the same Stainless Steel as surgical instruments (various degrees obviously, 304, 316, etc), having worked in a Central Sterile Supply of a hospital we were not allowed to use Chlorine to clean or sanitize the instruments.
All the literature I find on the internet & reading of books (not just homebrewing, but metalurgy, sanitation and others) supports NOT using Chloride (salts), Iodine or Chlorine on Stainless, it destroys the passivative nature of the metal (the ability of the metal to protect itself from corrosion). Chlorine is fine for anything but stainless.
If Coca Cola uses Chlorine to sanitize their kegs, then that would explain why Coke tastes like crap, they are cutting corners & using a cheap alternative sanitizer, just to save a few bucks so their corporate execs can drive a company Mercedes to & from work. They may even be using (ugh) aluminum kegs (again...cheap).
Since you aren't CC & don't work for them, don't follow their practices. Sure, sanitizing your keg with Chlorine once or twice, or three times or more may not seem to cause any harm, but in the long run, why take the risk?? Corny Keg, 1/4 barrel or 1/2 barrel, it doesn't matter, Stainless Steel is Stainless Steel.
I have to agree completely with NobodyMan on this one. Wait a couple days until you can get the proper sanitizing solution, your beer isn't going anywhere and a couple of extra days in the secondary fermenter shouldn't matter.
Take about 5 minutes and Google "Stainless Steel Chlorine" and see what we mean.
Another alternative I will suggest is called a Quaternary Ammonia sanitizer, almost all restaraunts use this as their sanitizer of choice, it's safe even if it's not fully rinsed off and it's as effective as Chlorine. Any food service store worth their weight carries it and it is very inexpensive.
Relax...have a homebrew!!!
Kent