VEVEY (Reuters) -Nestle will boost advertising and marketing, trim costs, carve out its water and premium drinks businesses into a standalone global unit, and implement other changes to drive growth under new chief Laurent Freixe, the company said on Tuesday. The Swiss food giant aims to achieve cost savings of at least 2.5 billion Swiss francs ($2.83 billion) by 2027, in addition to ongoing savings of around 1.2 billion Swiss