>>806584If you mean water management in terms of tides, then the tidal height depends on the location of the island (distance to the equator, water depth, ocean current etc). With some knowledge of the high water mark, you can build a house without it getting flooded.
The price for a room won't be extremely expensive, just a luxurious price. Airbnb has quite a few listing on small and very small islands. They usually go for $100 a night with a decent amount of reviews. The generated income will only suffice for off-island necessities.
>>806604It's not like I'm putting all my money aside. But I'm not buying anything huge. All my savings are being invested by my father who works in the economic sector.
Owning an island isn't always super expensive. There are hundreds of ~8 acre islands in Southeast Asia and in the Indian and South Atlantic ocean. If you want an island relatively close to the American, Canadian or Australian coast, then it's really expensive.
