Agua Fresca (Eat This) is a German recipe, right-click to translate. This popular Mexican drink is made with chilled water, along with galia melon and a few chia seeds for a light crunch (optional, they swell up after a few minutes).
Chia seeds are popular these days, and can be used to swell up puddings like jelly. However, you must always mix them with water, to avoid them expanding in the throat. For this reason, it’s best to avoid using them for children or anyone with swallowing difficulties (like Parkinson’s), to avoid risk of choking.