I always have a plethora of old t-shirts with stains or tears so this is a great way to reuse them. If you don't though, you can buy the t-shirt rags from most hardware stores or even just use washcloths.
As for the container, it just needs to seal so the wipes retain the moisture.
You may need to increase or decrease the amount of the mixture you use in the container depending on the size and amount of shirts used. The rags should soak up the entire mixture and be completely damp.
If your wipes start to feel dry overtime, add more of the mixture into the container.
Use Tea Tree or Lemon Essential Oils for added disinfecting properties.