making up formula bottles when out and about

[newbiebaby]

Hi
I am new to the bottles as until recently DD has been EBF. Am at a loss to know how to make up bottles on the move. I understand I have to mix the powder with hot water just before feed, but how do people then cool the milk before their babies drink it when out in the countryside, not near cold taps etc?
grateful for any advice
xxx

here's a thought.. maybe because we are using extensively hydrolyzed (processed) formula, it's bacteria free? It IS dairy-based, but there's basically no dairy left in it, IYKWIM.