Should all sensors be connected by i2c?

Do all water temperature/ph/ec/pump sensors need to be connected to i2c of adc1115 for normal operation?
i was connect to DS18B20 gpio4 without i2c and view it on the data live page, the number changes frequently up to 0-100

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It depends what communication protocol the sensor supports, is active, and that you want to use. If the sensor only outputs an analog signal, then you will need something to measure it. Microcontrollers usually have the ability to measure voltage, but single board computers, such as the Raspberry Pi, do not and require the use of an analog-to-digital converter like the ADS1115.