Drink Lots of Water, Harmony!
In October 2006, Harmony had problems peeing. She would go into the litter box, position herself as if she's urinating and then get out without having done No. 1. She'd then repeat this act over and over again, the whole day long. The vet said that it was because she didn't drink enough, causing her pee to crystalise. Harmony's favourite way of hydrating herself is to drink from the shower tap. As she can't turn the tap on herself, and Alex and I aren't camped out in the shower the whole day long, I was not surprised by the vet's pronouncement. To encourage her to drink so that she'll pass the crystals out, I made her a tuna drink (above) several times a day.
Since then, I've fed her wet food mixed with water to form a gruel-like texture every morning and the problem has not recurred. Well, except for the time when we went on a short holiday and my dad who was taking care of them, did not feed them wet food. Three days into the holiday, my cleaning lady called to tell me about Harmony's 'weird' behaviour in the litter box. I instructed her to feed Harmony her 'gruel', and she was right as rain by the time I got back the next day.