Adopt an older cat! There are way too many cats that are abandoned in shelters to be buying kittens from breeders.
You can syringe feed the kitten. For more information visit thecatsite.com/t/276288/3-week-old-kitten-not-gaining-weight
However the kitten acts and its personallity depends on what you should call it!
Instead of catching one, go adopt one.
no
you should call it kitty or....................
You should take it to a vet!
Get a kitten.
That is entirely up to you.
Ginger
If you're asking where to acquire a kitten, go to your county animal shelter.
If you want your kitten to live a long and healthy life, you should not let them out unsupervised.
This is not a good thing, and you should take your kitten to the vet immediately.