Feeding 5 week old kittens

Hello,

About a month ago I had a very pregnant stray show up on my doorstep, looking for a place to birth. We contacted our local cat rescue and decided to foster her and her kittens. Since then, she gave birth to 5 beautiful kittens (who are now 5 weeks old). She's an amazing mama, and an amazing cat. We have decided to adopt her.
Anyways... I have tons and tons of questions about the kittens. We have them for a few more weeks before the rescue adopts them out. The rescue is super busy and is terrible at getting back to me about advice. So hopefully some of you can help me!

My first question is about how to introduce food, and how much to feed. All the rescue has told me is at 5 weeks to mix some water with wet food and give to them. I have asked questions, with no reply.

2 of the kittens will eat the mush, the other 3 want nothing to do with it. I have tried letting them lick off my finger, put some on their lips to lick off, and mama cat come sand eats it in front of them. Is this normal for them to not want any, and do I just wait it out?

When they all start eating it, how much do I feed? There are 5 kittens. And mama pushes her way through and eats it too. Not sure if I should desperate mama while I'm feeding?

Thank you for any help! I'm so overwhelmed and so unsure of what I'm doing!

Mama cats have been handling this just fine for years so relax, don't worry.  Feed mama enough so there is a little left over on the plate and they can check it out.  Some eat sooner than others.  I've always mixed a little cream in with the food rather than water.  You should be aware that when the kittens begin eating solid food, they will also start pooping solid poop and that is something mama is not likely to be eating from them (different than her recycled milk which is what they pass when she is nursing).   So once there's solid food going into kittens, you need to start litter training them, AND they are likely to eat whatever litter they start in (i'ts a baby thing, oncethey start eating they taste everything) so DO NOT USE CLUMPING LITTER AROUND THE BABIES.  It's OK to have it in mama'sbox if her box has high enough sides that babies cannot go in.  Otherwise, change to non-clumping for awhile.  What I do for babies is take the low cardboard boxes that cat food comes in, fill those with beach sand or sandbox sand and put one box in each corner of the room. They seem to go for the corners instinctively once they start going on their own.  I start putting them in the boxes right after I feed them wet food.  When they have all done their digging and sand eating etc., I dig out any tiny tootsie rolls and scoop out any tiny wet spots.  One a day I dump the whole box, and I only use the same one a few days and then throw it away when it starts staying wet on the bottom.  Start hoarding boxes now.  After that stage (a week or so) I change out the low cardboard boxes for tiny littler boxes, also in all the corners.  Mama still has the BIG box to use and the kittens can climb into the tiny ones.