Not me, but my daughter bought an electric cat litter box for her 2 house cats, the litter is supposed to last 30 days, but only lasted 5, at a £150 plus £50 for 3 refill cartridges, not a good buy! She then bought a toilet trainer for them to use the toilet instead for £10 and they both cottoned on immediately!! Just need to teach them to flush now .
On the bottled water note, I'm afraid I'm guilty (only 17p a bottle of 2 litres though), unfortunately the water around here is so chlorinated it's just like drinking a swimming pool. I also use a filter jug for cooking water, but even that after boiling often still has a tang!