Luohan Guo water is more Tian, children prefer to drink. But this sweetness is not the sweetness of sugar, only a sweetener, so you can give children to drink. Now out is dehydrated Luo Han Guo, not the drying kind, drying is easy to fire, so you can drink dehydrated.
The second is tea, it can be white tea, or other Tieguanyin can be, more tea is also beneficial. White tea is also relatively sweet, so you can give children to drink.