In the house - I don't know anything about your family position, but possible options assuming you can get some privacy are:
- Towels on the bathroom floor, then put them in the washing machine.
- Laundry basket or dirty washing on the floor. Again, depending on whether someone else normally goes through the laundry, you may need to wash it before they get hold of it and start asking questions.
- Kitchen sink - whilst nobody is in the room and you think you have time to get away with it before someone comes. Will feel naughtier because there is the possibility of being caught.
- Bath tub - easy clean up, no damage, but still different to peeing on the toilet.
- Do you have a garden? Can you sit on the grass and pee, maybe just wearing a dressing gown to cover up what you are doing.
- Don't know how severe your lockdown is, but can you go for a walk and pee whilst you are out? I've recently peed on the pavement of a quiet road, in some woodland and into a canal to name just a few.