You can use caster sugar or regular granulated sugar to make tea at home. Caster sugar is sugar that's been ground down to a most beautiful texture. Caster sugar, also known as superfine sugar, consists of granules finer than table sugar but not as refined as confectioners' sugar.
Cube sugar, caster sugar and icing sugar are all more expensive but nevertheless suitable. Golden syrup or a light treacle may be used in red wines or strong dessert white wines, but the colour and flavour of this sugar affects the colour and flavour of light white wines.