We’ve done this!
Buy a 5 gallon bucket to fill with water. Can use the water station and let the water warm up in the sun before each use. Then use:
Portable changing/shower tent: Portable Pop Up Dressing/Changing... https://www.amazon.com/dp/B07BWCQV6T?ref=ppx_pop_mob_ap_share
Portable Showerhead: Ivation Portable Outdoor Shower, Battery Powered - Compact Handheld Rechargeable Camping Showerhead - Pumps Water from Bucket Into Steady, Gentle Shower Stream https://www.amazon.com/dp/B00IFHFJXI/ref=cm_sw_r_cp_api_i_ZD6DFH7QHF23ME5X734Q?_encoding=UTF8&psc=1