This document reports on the first GREAT case study cycle with sponsor Waterwise and can be considered phase 1 in that collaboration. Phase 2 and further dissemination activities will be reported on in subsequent documents. Water security, essential to both human survival and societal infrastructure, is significantly influenced by everyday individual behaviours. Yet, in many parts of the world, the topic receives limited public attention. In collaboration with Waterwise, this case study investigates the use of the GREAT case study cycle developed from the MIR approach (Tobi & Kampen, 2018) to design and use playful dilemmas and interactive activities. The goal of this work is to support citizen discussions that educate, share knowledge, and co-construct meaning of sustainable water use. Through case study workshops with Waterwise, three activities were developed for online water security discussions. A water perception and use survey, data exploration of supply and demand challenges, and a playful dilemma game. 25 participants took part in the initial implementation of these activities. Participants showed greater understanding of their water footprint and supply and demand challenges faced within the UK. The designed activities fostered wide ranging discussions when used in small groups of strangers online. Some Individuals reported less water use and greater concern for their water use behaviour. Water use discussions covered a wide gamut of behaviour changes and potential supportive policies and mechanisms that could help reduce water waste within the home. However, knowledge deficit within areas meant that ideas generated were not viewed through the practical implementation. Technological barriers were identified when engaging in this approach on mobile devices. Playful discussions can be an engaging and positive discussion space on sustainability practice online. Water system knowledge is low and affords an opportunity to educate and develop a vision of what water use looks like (water culture) but requires transparency on how the water industry supports this endeavour too. The designed approach could be used for online small-scale focus groups to engage with own water footprint and share knowledge on water security. Content could be adapted for a given social dilemma. However, time to make such content can be substantial.