Your best bet would be a suitable small aquatic or a tortoise. Box turtles keeping indoors is generally a bad idea in the long term, and to even be successful in the short term means becoming a zoo exhibit designer, a plumber, electrical engineer, and indoor gardener all at once. Without the mixxed elements of nature (weather, seasons, day/night cycles) they dont do well for more than a year or two.
If you are planning on moving to a space with dedicated outdoor room within a year, a hatchling box turtle might work. They can be delicate and a bit hard to care for, but their requirements are more simple than an adult and they tolerate their first year indoors very well (this is how I keep mine for one year before they move to outdoor pens.