What are some “less evil” options to avoid buying from Nestle?

Well, it depends on why you boycott nestle and on where you live. For example, if you boycott nestle for that watery stuff and live where the tap water is drinkable, then drink tapwater.

If you boycott nestle for their inability to guarantee the lack of slaves in the production of their chocolate and coffee, then check for chocolate and coffee producers that guarantee it.