Texas lawmakers appear to have reached a deal this week and are on the brink of passing a sweeping plan to invest billions into the state’s fragile water infrastructure and future water supply over the next 20 years, ending months of tense, back door negotiations.On Tuesday, the Senate approved House Joint Resolution 7, which will send to voters in November a proposal to allot $1 billion a year — $20 billion in total — until 2047 to secure the state’s water supply. That money will be used to fund new water supply projects, such as desalination, repairing old water infrastructure,