I wouldn't be worried about it not going into their mouths all the way. If anything, I'd say that it's better this way because you can regulate how fast the liquid's coming out. Otherwise, it might come out too fast and choke them. I am however, just going by hamster and squirrel experience, mice are probably different. Also, forgot to mention...you could try and check to see if they're dehydrrated or not by gently pinching their skin/fur at their neck, where their mother would pick them up. If it stays in the pinched shape for more than a few seconds, I'd suggest getting some electrolytes into them. There's a children's drin that helps...something called pediasure or pedialyle, not sure which. Or you could look on the internet for a home-made solution. If worst comes to worst, you cna use gatorade, but as a last resort (had to for my baby squirel when I first got him). As for solids- I'd probably put a few blocks of nutrablocks and maybe some cut up apple, just for them to nibble on, even now. As soon as their eyes are open, they should be wanting to try solid foods, but they might nibble on it here or there even with their eyes closed. Here's a chart I found on their development;
0-3 days the babies are blind, deaf, and completely hairless
3 days the pigment of the skin is visible on darker colored mice
5-7 days fur begins to grow and ears perk up
10 - 14 days eyes open and the babies will become increasingly mobile and begin experimenting
with solid foods
12-24 days the babies will enter what's called the "flea stage." They are extremely quick and jumpy,
which makes them very difficult to handle
21-28 the flea stage comes to an end, and the babies should begin weaning from their mother's milk
28-35 days males and females should be separated, and the mice are ready to go to new homes
ok so it didn't paste like a chart, but the info's still there.
Also here's a site that might be useful. i think it's for rats mostly, but it does mention mice...