where and how could i get the two items?
Unsure wether you still need this or not. You can get lactoid from clearing the dairy farm questline, freeing the cowgirls in the mountain and then interact with Cindy. Soon after, there will be Maishie or the dairy head maid. Interact and help her milk the cow, then she will give you the recipe for lactaid. For the soul fragment, you can get it from silver chest around the map.
I'm sure you can just continue on your save file since you can just craft them, also try not to give birth to those two cowgirl you can milk, you'll gain better milk if you keep them pregnant. For the honey part, I don't know how many honey you need to get the crystal, I have been giving her many honey but she has yet to give me the crystal. I'm sure I just spend an hour just for that. Just skipped her in my gameplay since she is not essential in the storyline. Hope this help
how do i get the milk thissle though? i have collected all of it across all the continents in all areas and there wasnt more than 15 in total. so its really hard to do anything for the dairy farm quest line. is there a place to buy milk thissle? maybe i can grow it at the mansion i nthe garden i restored? i cant interact with the garden so i dont know there either. but i cant find milk thissle anywhere after i picked it all, it never regenerates.
I'm sure you can just sleep and then they will grow back again (or maybe after few times of sleep, I do not know the specific), I do not know if there is a place you can buy it though. Garden in the mansion won't grow any milk thissle as far as I know. To interact with the garden you gonna need to have some specific seed that I have forgotten, I'm sure you can find such seed in the castle with minotaur and living plant