Will be travelling from Riga to Stockholm on Silja line I would like to know if it is necessary to book a meal onboard or if food in Riga is cheap. If food is cheap I'll take groceries on board the ship to eat for the eveing meal. All that I am interested in on the ship is sleeping abnd the view on arrival in Stockholm. I'm on a tight budget and since Stockholm will be expenisve I thougth I can save a little by doing this. Please advise. Thansk.