Really sorry to hear that, you must be gutted!
I hope I can give you a wee bit of help......I recently had the experience of hand rearing a pup from my bitches litter that was the runt. I decided to try bottle feeding the wee fella first before tube feeding. His sucking reflex was strong enough to suck from a bottle, but I found an actual babies bottle more sucessful that the bottle you get in the puppy feeding kits. I used lactol for him at first, then after some advice from my local agricultural suppliers I switched to ewes replacement milk......far cheaper and just the exact same as la