49. Dr. Pepper
Bit of trivia - the jingles for 47, 48 and 49 were all written by Barry Manilow.
51. Kellog's Frosted Flakes?
52. Chiffon margerine
53. Oscar Meyer Wiener, that is what I'd truly love to be, cuz if I were an Oscar Meyer Wiener, everyone would be in love with me
54. Palmolive liquid