Kits need raw meat, rabbit, chicken wings, cheap frozen mince.
Puppy food = puppys ,Cat food = cats. Get dry ferret food such as alpha, vitalin or james wellbeloved.
Leave that down all the time, moistened with warm water for kits.
Of course water 24/7.
If you have a pets at home near you they will sell their own ferret food & frozen blocks of
pet mince etc for now.