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I don't think there's anywhere really I need to have 5 bottles but it's nice to stop less. Last year I took 1.5 litres and I'd say I stopped once every 2/3 hours for water. If I only have to stop every 6/9 hours then that's a fair amount of time saved (I reckon just under an hour/day). Obviously there's the increased weight of the system but only for a short while will I be carrying it all before it gets drunk.
@inappropriate_bike two on the back behind the seat, 1 on the seat post and 2 at the front under the tri bars
Where on the route will you want to carry 4+ litres of water? In the Balkans it will be hot but also pretty hilly, no?