You can keep your snail in a well-ventilated, clear plastic or glass aquarium with a secure lid; the clear sides of the aquarium will let in plenty of light which the snails need and the secure lid will keep the snails from escaping; snails are surprisingly strong and can lift weights almost 50 times their body weight, so if the lid is not secure they will probably be able to lift it and escape.
Keep the aquarium in a safe place where it is not likely to be easily overturned, does not catch too much direct sunlight and strong winds, and is not exposed to heat from radiators or any kind of chemical spraying.
Place thick substrate – cocoa fibres, coir, peat, etc - on the aquarium floor and make sure it is always damp, not too wet.
Provide nooks and crannies for your pet to hide under and bark and obstacles climbing.
To maintain a 60-70% humidity in the aquarium, keep a dish of water in it and also spray the inside with water every few days.
Remember to clean the aquarium, put in new substrate and wash the snails on a weekly basis. Wash with clean water, never with detergents.