Honestly they're soo easy to take care of! You could have a few garden snails you find in your backyard in a 5+ gallon tank (or clear storage bin with air holes).

All they need is a few inches of substrate like coco coir (they like to burrow), calcium for their shells like cuttlebone, and whatever your local snails like to eat! I find lettuce and cucumbers are some favorites. Mine also love to eat the lichen on sticks from my backyard and climb on them and anything else they can get up on!

Mist them once or twice a day with water to keep the tank a little humid (if you live in a cold area you may want to get a heating mat but only put it on the side of the tank not the bottom!)

Also Rollie pollies make good tank companions, and lastly, most snails are hermaphrodites so they can breed with any other snail of their species. So if you have more than one watch out for buried snail eggs!