Go to pump.fun and Connect Phantom to pump.fun. Then type in how much SOL of $WAT you would like to buy and click place trade.
Use the right amount of slippage (0.5%-1%), if transaction doesn’t work increase gas on MetaMask.
To see your $WAT in your Metamask go into tokens, at the end click on import tokens, then click on Custom Token and paste the contract: 0x636bd98fc13908e475f56d8a38a6e03616ec5563and import.