Your bun is so pretty! I love how he flops! He's also got an elbow patch similar to my boy, what a cute little marking.
I bought four big tiles for dirt cheap at a local hardware store's clearance sales. Sometimes stores get those single pieces of tile that normal people just wouldn't buy. None of them match in colour and their patterning is half-half, but rabbits don't care at all. I paid 2 euros for those tiles, so i'd say it's a bargain.
Your bun may or may not try to bite it. Still, i wouldn't worry. The tiles are too hard and un-tasty for buns to do any more than an obligatory test bite/nudge and chinning. I know my buck took a taste at first but couldn't get anything and no longer bothered to chew it. Now he just likes splaying out to cool on those.
I don't know about water bottles though since i have two "rats" that will taste test anything. Even the insulation foil has a small nick because of them.
I've had one of them bite a hole in a plastic bottle(that was my first boy) so i'd swapped to different bowls after that. That's also why i've never risked with a water bottle. Some have mentioned that icing a bottle and wrapping it with towel and just letting it be on the floor of bun's leisure spot is enough.
Your water dispenser bottle/bowl thing seems to be a good fit-can't be tipped or bitten through, and it looks to be easy to drink from. If you're changing it twice daily, i wouldn't even worry about getting a bigger one. If it's too hot, i've had success with plopping an ice cube to the water to keep it cooler for longer.
My girl Iris seems to be a better model to show off the usefulness of ceramic tiles: