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Extra Large Dog Crate Converted to Rabbit Cage
30 Inches Wide x 48 inches Long x 31 Inches Tall
Good for larger rabbits (#8-#12) or 2 smaller rabbits (#3-##6)
This is one type of water bottle we use "Lixit Top-Fill 32 oz.-44oz.
We also use Lixit close top, rent a coop, etc. Some people perfer crocks or bowls, it's really up to you! Whatever the rabbits want, what is easy to keep clean, etc. 
One Option: Dog crate converted into Bi-Level Rabbit cage (24 inched Wide x 36 inched Long c 26 inches Tall)
Custom made wire stackers; we use 24 x 30 inches for our juniors and Bucks and 24 x 36 inches for our does (all Made by Theresa L Gonia/Hopping with Hope Rescue)
The Grey & Black cages are 24 x 30's that we use for juniors and bucks and the Blue & Yellow cages are the 24 x 36's we use for does. You can get guards to keep babies in or to help prevent buck from spraying you, although we find that if they want to get you they will, and we place the naughty boys in the lower cages! 
We use these types of indoor cages to raise babies in the house. We get asked a lot about the set up; Regular cat litter box from Walmart for $4, Hay Tack/Feeder combo over the litter box & water bottle on the side. We have the best results with litter training this way.
If you notice the 24 x 30 below with the grey plastic guards, those clip on and off for easy cleaning and adjusting, we love them!!! Contact Hopping With Hope for those. This size is great for juniors and bucks, enough room to hop and stretch out, but not so much it overwhelms them. 
We prefer the 24 x 36's to have plastic baby guards on them (middle cage with blue guards), much safer than baby saver wire, easier to clean (the 24 x 30's for juniors and bucks are on either side of the 24 x 36-so you can see the size differences) they also help keep hay/toys, etc. from falling out. Resting matts are a must, prevents sore hocks! In the left hand corner is out only stack not made by Hopping With Hope, it cost twice as much from a company, we had to put it together for ourselves (not fun) has baby saver wire, which we really don't care for. We also use puppy plan pens with heavy duty tarp for bottoms for exercise and playtime, which you can see videos of on our Facebook page. 
Pine shavings can be bought in economy sizes, the "Marth" brand at Fleet Farm is about $6, the TS brand is bout $5, and for litter we use the "Marth" or TS brand, both are about $6 for a #40 bag, all of these are a HUGE savings compared to your Walmart or Pet Store brands! You can take good care of your rabbits and not break the budget.