Inflation in Ghana

Since I have arrived here the cost of a 1.5 litre bottle of water has gone up from 1.20 GH to 1.30 GH. I figure that is a rate of inflation of almost 25% a year. I have not noticed a steep increase in the cost of other goods, however. So it is likely that other goods are increasing in price at a slower rate. Nevertheless, water is absolutely vital to life. It is not something like chocolate or Coca Cola I can do without. I may have to start buying water in bags like most people here instead of the more expensive plastic bottles.