Cold water sterilising?

[goingonholidayz]

We are going on holiday with DD (nearly 6 months) for the first time next week. DD is bottle fed and at home we use a UV steriliser. We tend to make a few bottles at a time and keep them in the back of the fridge for 24 hours. We have a temperature-control kettle so making up fresh bottles is pretty quick.

For our holiday, we've got some milton tablets to use for her bottles. We've used these before no problem but have always removed the bottle right before making it. I can't quite work out how long the bottle remains sterile for once removed and assembled? Can we still make some milk up ahead of time? I'm happy to make most of her feeds fresh if needed (and we are bringing plenty of ready-made milk for daytrips and meals out) but the time she wakes in the morning is very variable and I can't see her happily waiting for 30 minutes for the kettle to cool whilst we make up a fresh bottle, so would ideally have made her first bottle of the day the night before. Is this ok?

Thanks in advance!

Once you have sterilised baby bottles, don’t leave them out for long periods of time on work surfaces before using them. As they stay out, bacteria will slowly contaminate them again. You can either leave them in a Milton Sterilising Solution, or in a closed Milton Combi Steriliser for 24 hours, or in your fridge (with the lid and teat on) at a minimum of 4°C temperature.
Tip: when you purchase your feeding equipment, try to select a shape of baby bottles that looks simple and easy to clean.
Because infant formula can sometimes contain bacteria, it is important to make up each feed as your baby needs it, using boiled water (temperature 70°C or above). The hot water will ensure that any harmful bacteria get killed. Always remember to let the feed cool before giving it to baby.
Do not keep the feed in the fridge because bacteria can still survive and multiply. Always throw away any unused formula or breast milk after the feed.
https://www.milton-tm.com/en/consumer/advice-to-protect-baby#:~:text=You%20can%20either%20leave%20them,of%204°C%20temperature.
From the bottle feeding bit.

You sterilise baby bottles in order to kill off any remaining bacteria from formula milk that might have been missed when you washed them. Once they have been through a sterilisation process they are fine to use as this bacteria has been killed off and wont recontaminate the bottles until they have had formula in them. Babies don't need completely sterile bottles for feeds, just bottles that have been sterilised (if that makes sense!!)
If you make a bottle with 70 degree + water, cool it down quickly and store in a fridge overnight that will be fine. If you want to make feeds fresh you could also replicate the perfect prep method by using a hot shot of boiling water on the formula powder, then add a measured amount of cooled boiled water to quickly and safely make a bottle that is the right temp to feed. For a 6oz feed I would add 2oz of boiling water to 6 scoops of formula, shake well then add 4oz of cold water.

Ah thank you so much both!

@NannyR that makes complete sense. I do understand why sterilising is done (and know that lots of other countries don't even do it) but for some reason still get completely panicky about it. Thanks!