Here's what I learned the hard way for refilling the HP ink tanks for the
HP d145 officejet printer.

Don't drill a hole in the top of the tank like the refill kits recommend.
Ignore that and just flip the tri-color and black tanks upside down.

Simply drip high quality refill ink onto the sponge at the bottom
That's it. Refill until the sponge is nice and soaking wet.
A few paper towels will soak up whatever spills out.

BTW, yellow goes fast!

And, of course, don't ever let the sponge dry out as it shrinks away from
the sides of the tank and makes a huge mess when you refill it and takes
days (perhaps never) to regain its former shape.

PS: The ink from HP is water soluble so your pictures will be too. Also,
the ink isn't archival quality from HP. Best to get ink that is archival
quality from a printing shop which is extremely cheap compared to the
horrendously expensive low-quality HP ink supplied as OEM.