Noida flat's hidden utility costs are a shocker

Since last Diwali, I've been seriously looking for my first flat, Gaursons 4th Avenue bhi shortlist kiya hai. Brochure mein toh sab '24x7 power backup' likhte hain, but real-world mein kya scene hai? Matlab, full flat backup milta hai ya bas common areas aur ek-do light points? Meri friend ke society mein sirf common area backup hai, aur inverter ka alag kharcha aata hai. Uske parents bolte hain ye sab utilities ka hidden cost hota hai. Aur paani ka kya? Tanker dependency kitni hai? Gaursons 4th Avenue mein water supply reliable hai ya summer mein issues aate hain? Builder ka claim aur actual reality kitni alag hoti hai... honestly, I had no idea it's so complicated. Koi tips hain kya check karne ke liye site visit pe? Ab samajh nahi aa raha kaise verify karoon ye sab. Hope someone can share their experience.