Formula feeding on the go

It's 2 hours from when it's made I believe.

Four kids in and we have always made bottles from scratch every time because it's the safest way. A lot of people will think it's too much faff and tbh it is a bit of a pain but you get used to it.

A lot of people will also recommend using cooled boiled water then topping it up with hot. The problem with this is that you are meant to use water which is hot enough to kill any bacteria in the formula powder itself. So many people think the point of boiling water is to kill bacteria in the water itself. There is an element of that but it's also because of the possibility of bacteria in the powder. There are exceptions to this like for certain prescription formula powders which have to be made at a lower temperature.

Anyway, the Nuby rapid cool is good but you can also do similar without it. It does involve taking 2 flasks, one with water freshly boiled before you leave the house (remember to heat the flask up first so the water stays hotter longer) and one with cold water. You can do whatever ratio to get the temperature your child prefers. Ours have always been half hot and half cold. Remember you need to add the hot first then the powder, mix, and then top up with cold. Also remember, the powder displaces the amount of water so the final result will always be a little over the 5/6/7 oz mark etc. If this doesn't make sense try it out on ones you're making at home first by adding the entire amount so your 5 or 6oz or whatever of water then the powder and see what line on the bottle it now says.

Finally, I have always used the Tommee Tippee travel pots or similar. I even use them at home. Make them up in advance every night and don't have to faff about with scoops when baby is hungry.

We did the hot shot method. Powder in a sterilised bottle then added a shot of hot water from a flask (measurement varied depending on how much powder there was) then topped up with cold from a second flask. We bought two mini flasks for the job. The one for the hot shot was a Thermos brand and we tested it before use to make sure it kept the water above 70C for more than 6 hours.

This is going back a few years now but, I used to measure out the powder in the bottle. I’d also take a flask of cooled boiled water. When out, I’d ask for a shot or two of boiling water to put in the bottle and then top it up with my cool water to the perfect temp. I could take numerous bottles out, each with powder already in them. Also, I had those microwave bags to sterilise things when travelling and carried a tiny washing up liquid everywhere (did a lot of travelling with my kids when we were all younger and more adventurous!)

Don’t over complicate it. A flask with boiling water. Pre measured formula pots. I did this once a day for the entire days worth.
take however many bottles you want with a bit of cooled boiled water and just top up with the boiling water.

We were making bottles in advance and stocking them in the fridge, so once put in the insulated bag they would take a while before getting to room temp. In summer we would put an ice pack (we had some Flexi ones that could be rolled around the bottle), but he was a winter baby so was weaning by the time we needed this.
Our kids always drank their bottles cold as well, never had a complaint or an issue.

Our friends who where a lot stricter than us regarding the WHO and NHS guidelines would take a flask, ask for water in bars/restaurants to cool it down etc. A bit of a faff IMO.

With my second who was mostly breastfed and a summer baby, we went the lazy option and got long life formula bottles. It's more expensive but OMG it made our life so so much easier!
Our local co-op stocks a couple of brands, and we could buy stock in advance on Amazon.

[Edit: we also have the cooling flask but we mainly used it at home. Our problem when out is that they rarely needed just 1 bottle. If we go for a half day, they would need 2-3, so the cooling flask wouldn't work because it needs to be cleaned thoroughly]

This, surely if you’re keeping formula warm for any length of time you are creating a breeding ground for bacteria?

I tended to take an empty bottle and a carton of formula

Nuby rapid cool was a game changer for me. I had that and a mini flask with boiling water, and you can buy little tubs to measure the correct amount of formula into. Combine the boiling water and the powder in the rapid cool and your bottle is literally ready in a minute! So so handy.

You can either keep water hot or formula cold in the insulated bag. You shouldn't be keeping formula hot in it

You can also buy cartons of ready mixed formula which can be given at room temperature if the baby will take it, or heated. Slightly dearer than powdered formula but useful for outings.

I would suggest investing in a Nuby rapid cool, it will mean you can make a fresh bottle. It’s a game changer.