Hi,
Formula is good at room temp for 1hour.
a couple things you can do:
1) They do have insulated(sp??) bottles, made by playtex
2) Put your water in bottle and just mix your powder in when needed
3) You could pre-mix it and put a frozen Mr. Freeze in the bottle to keep it cool or just get a bottle bag that is insulated. You can get those at Walmart right by the bottles or
4) Buy a couple cans of premade formula, which i did when I was traveling from Alberta to New Brunswick.
Just a couple ideas for ya,
HTH
PS. Where in canada are you