Tap water in Indonesia is not potable. So do not drink your hotel tap water unless you boil it first. Bottled water is very popular and not expensive, popular brand is AQUA, ADES, 2 Tang etc. You can find them in department stores and mini mart such as Indomart, Alfa Mart and even in small street stalls usually in the corner of street intersection. In unfamiliar establishments or where you have no assurance of of sanitation standards, also take care with ice used in drinks.
Hospitals with 24 hours emergency rooms ER:
RS Umum Pusat Dr. Kariadi, Jl. Dr. Sutomo No. 16, Tel.: 6224 413993, 6224 413764, 6224 413476.
RS. St. Elizabeth, Jl. Kawi No 1. Tel.: 6224 831 0035
RS. Telogorejo, Jl. K.H. Achmad Dahlan, Tel.: 6224446000.
RS. Panti Wilasa Cipto, Jl. Dr.Cipto 50, Tel.: 6224 546040.
RS. Panti Wilasa Citarum, Jl. Citarum No. 98. Tel.: 62243542224.
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Ambulance: 118
Police: 110
Central Java Police HQ. Jl. Pahlawan 1. Tel.: 6224 831-1382
Semarang Police HQ. Jl. Dr Sutomo 19. Tel.: 6224 844-4444, 6224 8418400
Police stations:
Central Semarang. Jl. Brumbungan Tengah 41. Tel.: 6224 354-5175
North Semarang. Jl. Letjen Suprapto 45. Tel.: 6224 6921275
South Semarang. Jl. Sultan Agung 103. Tel.: 6224 8315123.
West Semarang. : Jl. Ronggolawe Selatan. Tel.: 6224 7610698
East Semarang. Jl. Majapahit. Tel.: 6224 6710863
Tourism Information Centre (http://www.semarang.go.id...):
Jalan Madukoro Blok BB. Tel.: 6224 7608570.
Jalan Pemuda 147. Tel.: 6224 3515451. Next to Novotel Hotel.