If your rabbit's water bottle is freezing, that's a good sign that it might be too cold for the rabbit outside. See the related question below for details.
To unthaw a rabbit's water bottle, you basically need a sink (or similar) and hot water.
If you only have one or two bottles, running it over hot water until the ice begins to melt will do. Afterwards, make sure the sipper tube (where the rabbit drinks) is unthawed, or the fresh water you put in will be useless.
If you have multiple rabbits, fill a sink about 1/4 (or even less may do, depending on how big the sink) full of hot water and let them unthaw. You will have to change the water every 5 minutes or so because the water will become lukewarm and cold, doing you no good.
Afterwards, refill them and make sure the sipper tube works.
Rabbits typically drink water from a water bottle attached to the side of their enclosure.
Rabbits can drink water from a bowl or a water bottle. However, providing a water bottle is generally better as it keeps the water clean and prevents spills.
Rabbits drink water from a water bottle or a water bowl to stay hydrated.
It takes only a few seconds to make a water bottle. Liquid plastic is injected into a mold which is rapidly cooled to reveal a completed bottle minus the cap.
Leaving a bottle of water in the freezer and then taking it out to thaw at room temperature is an example of freeze-thaw process. The water freezes when placed in the freezer and then thaws when taken out, transitioning between solid and liquid states.
Rabbits generally prefer to drink from a bowl rather than a bottle because it allows them to lap up water more easily, which is their natural drinking behavior.
It's fine to have either, but water bowls are usually less hygienic than water bottles as rabbits dirty the water quite quickly (sitting in it, urinating and pooping in it!). Rabbits also have the tendency to tip over bowls of water. Water bottleskeep the water clean for longer and saves you the job of constantly cleaning and refilling a bowl.
To safely thaw and warm breast milk for your baby, you can thaw it in the refrigerator overnight or under warm running water. Avoid using a microwave as it can create hot spots. To warm it, place the container in a bowl of warm water or use a bottle warmer. Test the temperature on your wrist before feeding it to your baby.
Honestly, all you need is a cage, water bottle, and food. Rabbits usually eat twice a day and small amounts (well, my rabbits do anyways, because I raise Netherland Dwarf rabbits and they are only 2 lbs.) Rabbits don't require a lot, just a clean, healthy environment with fresh food and water daily.
Rabbits should always have access to fresh, clean, pure water. Don't put anything in the rabbit's water unless advised by a vet who has experience and knowledge in rabbits. Replace your rabbit's water daily, and also clean the dish/bottle so that bacteria doesn't build up.
Using a rabbit water bowl is more natural for rabbits and allows them to drink more comfortably, but it can get dirty easily and may lead to spills. On the other hand, a rabbit water bottle is more hygienic and prevents spills, but it may be harder for rabbits to use and can freeze in cold weather.
Its best to alow them to thaw naturally at room temp for a few hours, you can thaw them in water, this will speed up the thaw but you may 'wash' away some of the flavour.