I have some news.
HP inkjet ink is mostly water.
There are fractions acknowledged in the MSDS (Material Safety Data Sheets, that have to disclose something about the components owing to environmental and/or material safety / worker protections regulations.)
These fractions are, for example:
water about 90 %
2-pyrrolidone about 10 or 15 % NOTE: Very irritant. Do not ingest or get on skin, may be flammable.
carbon black about 2 to 5 % NOTE: Possibly flammable or explosive. But, not in water solution. When dried, then powdered, with a bit of the other chemicals but not water, definitely flammable and/or explosive (rarely, in just the right conditions.)
isopropyl alcohol: about 2 % at most. NOTE Flammable, irritant, somewhat toxic.
This is authoritative. But is not information for your model: its 932 and 933 cartridges there is no MSDS about. But the above information is highly representative. Inkjet ink is pretty much water-soluble until it is dried, and always alcohol-soluble to some extent.
(As I said before.)
Material stated above is from MSDS from HP as follows:
for ink of the Q2361 series. Black ink, specifically.
I hope this answers your question. If so, please rate my answer - a five-star rating would be appreciated! Thanks.
(I'm concerned about what you said about ink drying out... there may be circumstances, or environment local to the printer, that are conducive to that. If you want to tell me how your printer's immediate locality is, temperature, humidity, dust level, etc -wise, I will go into that aspect also, of preventing drying-up.)