I feel stupid asking this, but I've Googled it and can't seem to find a universal answer.
I formula feed my 6 week old and due to lockdown/shielding, we haven't been out for more than an hour at a time really. Wherever we go we make sure we are home in time for next feed.
We would like to attempt a country park in the next week, possibly out for 3-4 hours. My baby is on SMA Comfort so don't really want to buy ready made. Would prefer to keep him on his powder.
From what I've read, I can take with me a sterilised bottle, formula pot and a flask of hot water? But how do I know what flask to buy and how do I know water will be over 70 degrees after say, 3 hours of being in flask? I'm worried I'll mess something up and make him poorly 
If somebody could tell me exactly what to do, that would be fantastic! And any recommendations for a flask? Or will any do?
I use a Perfect Prep at home so never had to contend with bottle making from scratch. And I can't take my Prep machine out unfortunately 