Small aquatic plant/substrate/rocks (BS7)

Hi! My neighbour rescued a jar of ramshorn snails from a skip... we've got them in some jars and have managed to find a little bit of moss and a couple pebbles, and are currently feeding them bits of cucumber and broccoli.... think is, they're still living in a jam jar which is far from luxury, and I myself live in a caravan so I can't have any plug in water pumps etc...

I'm after looking for a small goldfish bowl perhaps? And ideally some small aquatic plants, as I was hoping to try make a little bowl up for them with a more natural environment, plants to oxygenate the water instead of pumps etc... these types of aquatic snails are stupidly hardy and can survive and thrive in just a bucket of tap water, they don't need specific light or much at all really, which is how they've managed to survive being thrown out with the rubbish in a sealed jam jar 😅

I know they're just 2 small water snails, but they're little creatures that I'd love to be able to look after properly and give them something better than they've got currently.

If anyone has anything spare or left over from a past pet please let me know. I'm based in horfield and struggle to get around much but can walk short distances. Please do reach out if you think you have something we could use. Thanks, love 2 hopeful snails 🤗

Edit: we have a bowl now for Biggie Snailz and Missy Shelliott, but if anyone has plants/substrate/stones for the bottom we'd be very appreciative 🥰