Twins with Special needs (adoption)

Hello I am a foster mom.  I took in newborn twin girls that weighed 2 and 4 pounds at birth.  The girls were placed with us for 90 days, and were to return to their birth parents, but biological mom and dad weren't able to keep up with their special needs or get clean.  The girls were going to be separated and placed for adoption because the needs of one of the girls was so grand.  She is on a feeding tube and needs multible surgeries. She's been in the hospital too many times to count.  In order to keep the girls (Identical twins) together, my husband and I adopted them (although we thought we were done raising children)  We love the girls to death and are commited to them.  THe problem is we need a bathroom remodel to accomadate for their needs.  We have NO Bathtub. Little Ava NEEDS a tub to soak her body.  She is mostly bones with NO fat and a GTUBE that needs to be cleaned properly.   The girls are currently using the kitchen sink and our cabinets are water logged and ruined because of it plus they have out grown it.   They are the sweetest little girls ever, but they are SO hyperactive with no impulse control. NO one will baby sit them and we are doing all we can to stay afloat.  Please help us get get rid of our shower in order to make room for a bathtub for these little girls.  THEY LOVE THE WATER SO MUCH.  Thanks for reading.