Serbia uses the Serbian Dinar (RSD), though euros are widely accepted in tourist areas and at border crossings. Cash is useful for smaller purchases, particularly in rural areas such as Fruška Gora and the monastery regions of southern Serbia. Tap water is generally safe in Belgrade and larger towns; bottled water is recommended in more remote areas. The tour moves across four countries with varying infrastructure, and standards of accommodation and service can differ — particularly in smaller towns. Tipping is customary and entirely discretionary. The tour operates across Serbia, Montenegro, Bosnia and Herzegovina and Croatia, each with its own currency; your guide will advise on local practicalities throughout.