All plastic surgeons will have their own post-operative instructions. These vary from surgeon to surgeon. As far as a tummy tuck, you will likely have a pain pump for at least 5 days and will not be able to bathe. But, consult your physician for his/her specific guidelines.
Your surgeon is the one to whom this should be addressed. The surgeon knows you, knows what was done, and has followed your recovery, and none of us have those advantages. All the best.