In ours, the coolant is referred to as “PG25” (distilled water with 25% propylene glycol, plus corrosion inhibitors and other additives). It’s widely available, and pre-mixed so it just gets poured straight in.
Your problem is going to be quantity. it might be cheaper per unit, but buying less than a 200 litre drum (if not a 1000 litre IBC) will prove to be a challenge.
I’d suggest a rethink, honestly.
Not seen mentioned yet, but Homeworld (1999).
The transition from the opening cutscene to the game proper scored to Agnus Dei (Adagio for Strings) by Samuel Barber really set the tone for the thing.
I don’t remember much else about the soundtrack, but that one piece stuck with me.