24 weeks pregnant with little water in sac is that safe for my baby? I been put on bed rest?

Your baby needs amniotic fluid for proper development and your ability to carry the baby to term. Sometimes there is a small leak or perforation in the sac, that is why you have been placed on bed rest. The doctor will keep a close watch on the amount of fluid, if it gets dangerously low they will either try an infusion- of saline like liquid, or they will take the baby. Stay on bedrest and do as the doc tells you. The longer you can keep the baby inside and growing the better things will be.