Thank you for your prompt help and advice, Charis!
HowdoIPigeon, according to the time zone of your post, you could be in Australasia or Australia, is that the case? Unfortunately, it's very difficult to find rehabbers over there, but if you follow Charis (Matilda's) instructions, you will be able to look after the little one without much difficulty or expense until he's ready to fly out on his own.
The baby appears healthy, just a little too young to fend for himself. In 2 1/2 or 3 weeks time he should have his feathers fully developed, and before that he will have learnt to eat and drink for himself. If you are going to release him as soon as he's ready, it's best to avoid too much contact with him outside meal times, or he will think you are his parent!
Just a note about how to provide water:
The best way to introduce a baby to drinking is to gently dip his beak in a bowl of tepid water, making sure that his nostrils don't go in the water. This photo will show you what to look out for:
The reason for using tepid water is that, at this stage, the baby won't have experienced any food or drink that wasn't at body temperature, so giving him water at body temperature makes it much easier for him to accept it. You may need quite a few tries before he gets the idea, but he will!
And once he's got the hang of it, you can give him the water at room temperature.
Best wishes for you and your little guest, and thank you so much for taking him in and giving him a chance to make it! Please keep us posted!