Why not just buy any OEM quality OAT (organic asid tech) coolent as a consentrate. It fits the bill for all your requirements, and you will find main dealers do just that as it is cheaper than using 'pre-mix' from their supply chain. (Obiously if you dont need OAT, use glycol)
Remember colour means little. However blue is norm glycol, OAT is normally pink/red/orange, and some glycol 'compatible' OATs are green or yellow.
If you want to go to town you can mix it with distilled water (bought for batts, irons etc). That way you only need to store one small bottle and always can make up more.
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