The recipe recommended by JoeFish (home made no-rinse sanitizer) on the homebrewtalk.com wiki has been deleted, so I'm reproducing it here, as rescued via the wayback machine:
For all of you wondering, yes you can make your own sanitizer at home.
I recommend a good commercial no-rinse sanitizer (NRS) like Star-San,
Iodophor, etc. In a pinch though, there is a simple solution to your
sanitation dilemma (pardon the pun).
Everyone has heard the home brewers warnings about bleach and the
brewery, and they are right. However, the man himself Charlie Talley
(manufacturer of Five Star Chemicals, makers of Star-San) spoke about
a homemade concoction that kills just as well in the event of large
scale sanitation or the using up of your favorite sanitizer. Charlie
recommends an accurately measured solution be made from the "dreaded"
bleach, water, and house hold distilled white vinegar.
A mixture ratio of 1 oz distilled white vinegar to 5 gallons of water
is thoroughly mixed, and then 1 oz of household bleach is added only
after the vinegar is diluted in the water will work perfectly. This
high dilution of the vinegar in the water before the bleach is added
prevents any out-gassing of chlorine from the bleach that is added at
the end. The vinegar actually helps the bleach work as a better
sanitizer due to acidifying the solution more. The high dilution also
means it leaves no residual tastes behind of bleach or vinegar, making
it a perfect "cheap" no-rise sanitizer.