I have some bamboo out in the shed that I can use if needed.
Day 44 - Update
Noticed she had finished her reservoir. That's 2 litres a day she's drinking now. Luckily, I prepared 10 litres of water yesterday (left for 24 hours to de-chlorinate), so mixed up another batch of week 6/7 (as they are identical) with addition of some PK 13/14.
Whilst preparing, I noticed an issue with my TDS pen. Luckily, I had a spare out in the Greenhouse. I now need to get a new spare.