Identify three suitable investment products (which could be an investment fund, an investment trust, or ETF) that invest in water (broadly defined to include water companies, salination, water technology, etc) and recommend one product that you think would be the best choice.

The funds, investment trusts, or ETFs should be listed in London or should be accessible by a UK investor. The reasons for your recommendation should be explained and could consider, for example, cost, fees, performance, and the sectors of the water industry in which the fund invests, etc. Your reasons should include a comparison between the funds or investment trusts or ETFs you identified.