Whats an inexpensive alternative to breast forms?
put birdseed in the bottom of a stocking and tie it off at the ankle. Cut the stocking just above the knot. Flatten the sack of birdseed making sure that the knot is in the center of the circle. Position the knot in the same place a nipple would be if it were your breast. Stuff your bra with this make shift boob. I hear that it has a similar feel and weight as a real breast. Avoid water at all costs. It does not have even remotely the same feel as a real breasts and there is always the risk of leaks. Another thing you could try, mind you I have not done this myself, is to fill a balloon with some shampoo or a similar gel. Tie off the balloon. Make sure to only fill the balloon with enough gel to fill the bra and no more. I advise the birdseed method because the balloon will fill into a sphere and will be harder to fit to the shape of the bra’s cup. This in turn will make it look less realistic.