I have a tub, but my son just stands in it while I use a shower head to wash him. I also use nonslip mats to avoid him falling. He is 18 months old.
girl clean up the kitchen sink place a i small towel and sit the baby down wand wash him up
Cheap laundry basket from dollar store May suffice
You can buy an inflatable tub! If your bathroom is large enough you can bathe him in there.