Little number 3 looks to be off to a good start - congrats and I hope its a girl for you Just be patient with the others and give them time.
But I wouldn't be giving them any more water for now, they look plenty wet enough in the pics. A little seedling needs only a small amount of water.
If you do still have a few dollars to spend on them then I would suggest looking into something to measure your PH. Perhaps a drop kit or better a meter. Your little ones will appreciate being watered with ph'ed water.
Have you also been thinking about more light for later on? What you have now is great for seedlings but once they get growing they quickly out grow that.
Fingers crossed for your other seeds, hope they come through.