Edrooney: crock pots /essen pots are out of my budget, or so I thought... tips for where to get a cheap one here? Yogurt machines can be found on Mercadolibre for 100 - 200 pesos, typically, and with the big bowl I can make 2L at a time. I like the oven with warm bread stone idea, I may try that as I have both of these things! For thicker end product, you could try adding powdered milk if you haven't already.
Straining requires putting it in a colander over a plan and sticking it in the fridge, 30 seconds of active time and so worth it! Also, if you like breadmaking (I've got a sourdough starter on the go at the moment, fingers crossed, it's my first time), the whey is good for that and an almost infinite number of other things besides (gardening, fermented foods, skincare etc etc etc). I put any leftover on my compost pile.
syngirl: this has been in the news since the end of May this year, yes. It's not toxic in and of itself, but as with most things it's how it's dealt with/ disposed of. Cheese whey poses similar dangers, but since that hasn't been highlighted in the media, toxic yogurt whey is what people are talking about at the moment.