When you have orphaned puppies and no foster bitch, the solution is to make milk replacement.
This is on the notion that colostrum has been provided, see how here
The ingredients needed are

: 1) 340 g of unsweetened evaporated milk

2) 369 g of boiled water..

3) one bottle of beef baby food .

4) 227 g of unflavored yogurt.

5) 2 cooked eggs

https://veterinarymedicineechbeebolanle-ojuri..com/2020/06/how-to-make-milk-replacement-for-puppies.html