- Remove any labels from the bottle and fill it all the way to
the top with water. - Add a ketchup pack to the bottle. - If the
ketchup floats, you're all set - go to step 4. If the ketchup
sinks in the bottle, go to step 5. - For the floating ketchup
pack simply screw the cap on the bottle and squeeze the sides of
the bottle hard. If the ketchup sinks when you squeeze it, and
floats when you release it, congratulations, you're ready to
show it off. If it does not sink when you squeeze it, try a
different kind of ketchup pack or try a mustard or soy sauce
pack. - If the ketchup pack sinks, add about 3 tablespoons (45
ml) of salt to the bottle. Cap it and shake it up until the salt
dissolves. (Kosher salt will keep the water from getting too
cloudy, although it will usually clear up over time if using
regular table salt.) - Continue adding salt, a few tablespoons
at a time until the ketchup is just barely floating to the top
of the bottle. - Once it is consistently floating, make sure the
bottle is filled to t