It was fun having Sheilagh there putting the house through its paces despite not being hooked up to water yet. So the first chore was to fill a 5 gallon bucket with water and bring it into the house where we put it in the shower pan. I was also dismayed to find that the sink drain leaked likely because I had not put enough silicone down when I installed it. So we had to make do with spitting into the shower pan drain while brushing teeth.
The challenge is to figure out how to separate the two. I used a funnel in mine. And found an oil pan I liked to drain it into. The oil pan lies flat in the bankers box I had on hand. I combined that with the city provided compost bucket.
This effort has sufficed, but I have plans to make another toilet specifically for the tiny house using a chair. Because I can feel people flinch when they see a toilet out in the open in a living space. To afford some privacy for us I hung up a shower curtain for the duration.
For our trial run I repurposed a wooden recipe box to use as a sawdust container and added a garden trowel. I have been collecting sawdust from all the wood I've been cutting and storing it in a pet food container a client was throwing out.