I don’t live in Spain, so idk if this is useful. I also don’t know what products you need. Here’s some products that I thought you might want to look into though. But in the US, you can buy hay ( Timothy, alfalfa) from your local farmer. A litter box can be simple (low sided plastic box) and litter can be shredded newspaper. You can also make homemade rabbit toys, (there are many sites) a few of which are toilet paper tubes to toss, and apple tree twigs. You can also (although I can’t) weave long strands of hay to make a simple grass mat for your bun to chew. I don’t know if this is available in Spain, but these are just a few ideas.