my adult blood girl is currently soaking in a plastic bin i got off amazon. it wasnt very expensive and easy to clean. https://www.amazon.com/gp/product/B0006383JG/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 you can get which size fits your enclosure.

my big redtail has a parts pin that he soaks in. it hold almost 4 gallons of water. SOB still likes to tip it over. like this but much bigger, they are expensive but the wife got it from the throw-aways at work. https://www.amazon.com/Akro-Mils-30210-Plastic-Storage-Stacking/dp/B001SR4YEC/ref=sr_1_22?crid=E51KYBE3FBI5&keywords=parts+bin&qid=1683989513&s=industrial&sprefix=parts+bin%2Cindustrial%2C73&sr=1-22