I have done an overnight feed and it was fine. I wouldn't risk eggs, meat chicken, rice and so on but in an attempt to aid sleep
I made a concoction of cherry juice, (from real cherries) lettuce juice, almonds, goats milk and oats as they are all supposed to promote sleep......which it didn't!!! But I don't regard anything there as a bacterial risk. The concoction was made up in a clean environment, it went into sterile bags, frozen immediately, defrosted in a fridge and given with a new giving set. I can't see anywhere along that time line where bacteria would flourish? Answers on a postcard please
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I think you would have to be exceptionally unaware of basic hygiene to contaminate food, though this is what some dieticians will tell you, like we all feed our children salmonella contaminated foods. You can do a cheap online hygiene course if you are unsure of this type of thing. A pint of milk left out in a kitchen overnight is not going to be teaming with bacteria by the morning though raw chicken is another matter, so it's just a common sense thing and not be scared or intimidated.
Giddy overnight feeds el formula because it is such a faff to make up a feed but we are working to get enough calories and fluid in over the day so it is not needed. More often than not he will puke on it.
Ideally I would wait a bit for the BD though I know mums who have done it down an ng tube and started immediately the peg went in. But for a newbie I would just get used to the vagaries of the tube itself, not least where to stuff it, trousers, waistband??? If the dire rear hasn't stopped in a few days I'd look at bd again. Everyone starts with Ella's pouches! You don't need to worry about lumps in the first ones but they re minuscule in the calorie department.
20ld. We have been fortunate here to escape all the devastation unlike a few years ago when majorly flooded so I feel for you. Hope the pier is still standing and survives to next onslaught. 
Salmon and watercress not posh! Looks very green and smells fishy lol