Hi jenis, actually andman is lill bit costly.but it doesn't matter if u pre plan everything.firstly u have to search for hotels there r so many hotels which r cheaper then other if location does'nt matter to u.port blair is very small city so it doesnt matter where r u staying.take a hard copy of port blair map bcoz u may face critical network issues in port blair.u can enjoy so many spots like marina park, gandhi park, cellular jail, joggers park, sagarika, aqarium etc at just walking distance.a 7-10 days trip cost u about 30-40 thousand per person with food nd transport so better to go with team or couple it cost u less.nd u asked about drink nd all, i dont have much idea about its cost but there r several beach side restos u can enjoy there.nd best time to visit here is october to may.