As long as he has access to it when her wants ( at this age ) then he will drink when he's thristy...
keep nutrical on hand always.. sometimes their blood sugar can drop if they are not eating enought, using up to much energy, if they get to cold from being outside etc...
make sure he's eating well.. and remember that he's a baby and he will sleep ALOT.
I think i saw that you live in PA.. if thats the case make sure he stays warm IF he goes outside...
We live in Michigan and last Jan. When we got Izzy it was so cold that i had her go on puppy pads.
Congrats on your new baby... This is a great place for advice,, go through as many threads as you can... It was the thing that really helped me... Yorkies are the best breed out there ( at least I think so) But they come with alot of care so you need the know the most you can