Star San Acid Sanitizer.  8 oz size.  No rinse when mixed properly.

Star San is my sanitizer of choice.  It is effective, food safe and no-rinse.  It is also very cost effective if you use the spray bottle method.  See: Tip: Star San Tips, Tricks and Guidelines – Using Star San In a Spray Bottle

Why is this my favorite size of Star San?  It all has to do with shelf life.  See: My Favorite Size of Star San & Why

Star San – 8 oz – note that multiple variations of this product may be available, as such a different version may appear at this link