Bath toys can best be made from articles around the home. A colandar, or sieve, any plastic bottle with holes punched in it. No need to purchase anything special.
Cardboard boxes (provided you have somewhere to keep them, will provide children of all ages countless hours of imaginative play. My children are now in their late forties/early fifties, but still treasure photo of three of them, plus a couple of stuffed toys, in a long train made out of several boxes.
In the good weather, would purchase lining paper for walls, and put great lengths of this outside in garden, along with loads of water-based paints for them to make as much mess as they liked.
Wooden dolls house from Galts (back in the early 1970's, along with Galts wooden trikes. Children do NOT need a massive amount of toys, a few that give them the opportunity for using their own imaginations and time with adults to join in is far more important.