It is best that you do not use litter with chemicals added to keep down odour. Every time something is added to litter the cost goes up and the cat is subjected to something that is negatively going to affect its' health. The companies that produce the litter do not care about our cats as much as they care about the almighty dollar so use your head and do not be influenced by the funny cat on the box holding its' nose. Instead, buy the regular litter with baking soda added or add a teaspoon or two of baking soda every few days to absorb the odours.
Label and date the dish and it should stay fine for a week in your fridge.
And if your cat seems bored and is starting to scratch the furniture or hang from the curtain, it's time to dig out a box, fill it with tissue paper and sit it in the middle of the room. Problem solved.