WaterStuff.shader

		struct Input
		{
			float3 worldPos;
			half4 screenPos;
			half4 grabPassPos;
			half4 waveUV;
			half4 grabPos;
		};

		half _NormalScale;

		// Splash Offset
		float4 _SplashData[10]; // Position XYZ, Timer W
		half _WaveRange;
		half _WaveHeight;
		half _SplashTime;
		half _Smoothing;
		half _SplashNormalFactor;

		float3 GetSplashOffset(float3 wPos)
		{
			float3 totalOffset = half3(0, 0, 0);
			for (int i = 0; i < 10; i++)
			{
				// Add splash strength info to array
				// Add ripples
				half timeLeft = _SplashTime - _SplashData[i].w;
				half sqrDist = length(_SplashData[i].xyz - wPos);
				half distMod = (_WaveRange - clamp(sqrDist * sqrDist, 0, _WaveRange)) * 1 / _WaveRange;
				totalOffset += float3(0, _WaveHeight * timeLeft, 0) * sin(_SplashData[i].w * 15) * distMod;
			}
			return totalOffset;
		}

		void ToonWaterVert(inout appdata_full v, out Input o)
		{
			UNITY_INITIALIZE_OUTPUT(Input, o);

			float4 world = mul(unity_ObjectToWorld, v.vertex);
			world.xyz += GetSplashOffset(world) * v.color.r;

			// Create fake neighbor verts who we'll run the same effect over
			// so we can calculate the right normal for after we've moved
			half3 rightV = world.xyz + half3(0.35, 0, 0);
			half3 forwardV = world.xyz + half3(0, 0, 0.35);

			rightV += GetSplashOffset(rightV) * _SplashNormalFactor;
			rightV -= (rightV - world.xyz) * _Smoothing;

			forwardV += GetSplashOffset(forwardV) * 2;
			forwardV -= (forwardV - world.xyz) * _Smoothing;

			v.normal = normalize(cross(forwardV - world.xyz, rightV - world.xyz));
			o.worldPos.xyz = v.vertex = mul(unity_WorldToObject, world);

			half4 clipPos = mul(UNITY_MATRIX_MVP, v.vertex);
			o.screenPos = ComputeScreenPos(clipPos);
			o.grabPos = ComputeGrabScreenPos(clipPos);

			o.waveUV.xy = o.worldPos.xz/100 * _NormalScale + _Time.x * 0.1;
			o.waveUV.zw = o.worldPos.xz/100 * _NormalScale * 2 - _Time.x * 0.05;
		}

Because this might cause confusion, you don't need to calculate screenPos and grabPos. I use those in the fragment function for refraction and edge foam.