UK Research and Innovation (UKRI) has released information clarifying of the UK's position within Horizon Europe. You can read the statement in full on their website.
You can also view the current list of work programmes in the Europa portal. There are over 100 different streams of funding where water could be a core focus, but it helps to be open minded when reading and interpreting the information. The Water Innovation and Research Centre (WIRC) are working on putting together a summary guide of these opportunities to help accelerate your ability to engage with Horizon Europe opportunities.
Over on the WIRC blog, we have collated a list of the calls most explicitly aligned with water. You can read a list of the water-related calls in this blog post. The list, however, is not exhaustive and so we recommend that you check the programme in full.