I have extra seed hoppers full. Large waterers with chlorhexadine solution in the water to stop it going off and that's about it. I have never had a loss whilst on holidays. I agree if longer then a week then you would need someone to help. Well I'm in no way having a go just hoping it helps anyone worried and it's what works for me.
Also deb I see your point and I think you have more birds then me

Also I leave my aviaries completely covered from winds a bad weather. I'm only a novice but I hope it helps anyone.
And as for green food I feed my birds heaps plus sprouted seed but a week with out it won't hurt them. Haven't scoured a bird yet either luckily. Ahwell there's my rant