If you mix anti-oxygen and anti-hydrogen do you get anti-water?
"one can mix antihydrogen and antioxygen in definite proportions
and then combine them chemically (the consequences of this
explosion in the antiworld may be as lamentable as in the ordinary
one) and get anti-H2O, i.e. a transparent liquid substance boiling
at 100 °C and being a good refresher (naturally for antipeople), in
short, one that resembles in everything its counterpart, water.
Similarly, all kinds of antimatter reproducing all varieties of the
matter surrounding us may be combined from elementary
antiparticles."
(http://www.springerlink.com/content/xk17271664g4r641/ click on
"PDF")