How to keep paint fresh??

Ok, so I've been doing a huge painting project on my wall and I've mixed a lot of paints from the buckets into plastic cups. I need to go on vacation for a week but i need to keep these new shades good so they don't dry out, any suggestions on how to best go about doing that? I'd REALLY appreciate it.How to keep paint fresh??
Cover the cups of paint with plastic wrap, actually let the plastic rest on top of the paint it self, creating an air-tight kind of skin...this may sound silly, but then put them fridge, on the bottom shelf or something. I have kept wet brushes fresh like this for days, and paints for weeks... this is assuming you are using Acrylic. How to keep paint fresh??
Sadly plastic isn't airtight and if your paint is in cups you will have a hard time getting a good seal even with layers of plastic wrap and foil. I'd suggest going to a craft store and buying glass jars that are sold for candle makers. Look at the number and quantity of each paint color that you have prior to shopping for jars. Acrylic paint can also stored in the refrigerator. I'd remove all the items from the vegetable drawer, this drawer is usually moister. You can place a wet towel in the bottom of it as well to add humidity.





As a side note, consider sealing your artistic creation with faux finish sealer. Lowes, Home Depot and Menards all carry as sealer sold with their regular home paint. It will last years longer and be much easier to clean and resist marks and scraps.
The best thing I've found on projects (but not as big as yours) - screw-top jars such as empty coffee jars. Cling film might do it (tight over the cups), but the oxygen is mixing with your paint already, and there might be a skin over the paints if they are not completely air-tight.